Re: [R] print and lapply....
Dear Rui, THanks a lot! THanking you, Yours sincerely AKSHAY M KULKARNI From: Rui Barradas Sent: Tuesday, November 8, 2022 8:51 PM To: akshay kulkarni ; R help Mailing list Subject: Re: [R] print and lapply �s 14:47 de 08/11/2022, akshay kulkarni escreveu: > Dear Rui, >The replies from you, Bert, Tim and solved my problem. My > last question: what if I put print inside the body of the function passed on > to lapply, instead of separately in the function argument of apply? Is this > what you insinuated in your reply? > > THanking you, > yours sincerely, > AKSHAY M KULKARNI > > From: Rui Barradas > Sent: Tuesday, November 8, 2022 2:20 AM > To: akshay kulkarni ; R help Mailing list > > Subject: Re: [R] print and lapply > > �s 19:22 de 07/11/2022, akshay kulkarni escreveu: >> Dear Rui, >>THanks for your reply...The point is the loop is a >> scraping code, and in your examples you have assumed that the body acts on >> i, the loop variable. Can you adapt your code to JUST PRINT the loop >> variable i ? >> >> By the by, I think I have stumbled upon the answer: The lapply() caches the >> result, and prints the output of the function in question immediately after >> printing the final i. The i's get printed serially, as the function >> progresses >> >>> lapply(1:4,function(x){print(x);Sys.sleep(x^2);x^2}) >> [1] 1 >> [1] 2 >> [1] 3 >> [1] 4 >> [[1]] >> [1] 1 >> >> [[2]] >> [1] 4 >> >> [[3]] >> [1] 9 >> >> [[4]] >> [1] 16 >> >> Here x^2 's print only after 4 is printed on the console >> >> tHanks anyways for your reply >> >> THanking you, >> Yours sincerely, >> AKSHAY M KULKARNI >> >> From: Rui Barradas >> Sent: Tuesday, November 8, 2022 12:24 AM >> To: akshay kulkarni ; R help Mailing list >> >> Subject: Re: [R] print and lapply >> >> �s 18:33 de 07/11/2022, akshay kulkarni escreveu: >>> Dear Rui, >>> Actually, I am replacing a big for loop by the >>> lapply() function, and report the progress: >>> >>> lapply(TP, function(i) { BODY; print(i)}) >>> >>> Can you please adjust your solution in this light? >>> >>> THanking you, >>> Yours sincerely, >>> AKSHAY M KULKARNI >>> >>> From: Rui Barradas >>> Sent: Monday, November 7, 2022 11:59 PM >>> To: akshay kulkarni ; R help Mailing list >>> >>> Subject: Re: [R] print and lapply >>> >>> �s 17:17 de 07/11/2022, akshay kulkarni escreveu: >>>> Dear members, >>>> I have the following code and output: >>>> >>>>> TP <- 1:4 >>>>> lapply(TP,function(x){print(x);x^2}) >>>> [1] 1 >>>> [1] 2 >>>> [1] 3 >>>> [1] 4 >>>> [[1]] >>>> [1] 1 >>>> >>>> [[2]] >>>> [1] 4 >>>> >>>> [[3]] >>>> [1] 9 >>>> >>>> [[4]] >>>> [1] 16 >>>> >>>> How do I make the print function output x along with x^2, i.e not at the >>>> beginning but before each of x^2? >>>> >>>> Many thanks in advance >>>> >>>> THanking you, >>>> Yours sincerely >>>> AKSHAY M KULKARNI >>>> >>>> [[alternative HTML version deleted]] >>>> >>>> __ >>>> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see >>>> https://stat.ethz.ch/mailman/listinfo/r-help >>>> PLEASE do read the posting guide >>>> http://www.R-project.org/posting-guide.html >>>> and provide commented, minimal, self-contained, reproducible code. >>> Hello, >>> >>> Here are two options, with ?cat and with ?message. >>> >>> >>> TP <- 1:4 >>> lapply(TP, function(x){ >>> cat("x =", x, "x^2 =", x^2, "\n") >>> }) >>> >>> lapply(TP, function(x){ >>> msg <- paste("x =", x, "x^2 =", x^2) >>> message(msg) >>> }) >>> >>> >>> Hope this helps, >>> >>>
Re: [R] print and lapply....
Às 14:47 de 08/11/2022, akshay kulkarni escreveu: Dear Rui, The replies from you, Bert, Tim and solved my problem. My last question: what if I put print inside the body of the function passed on to lapply, instead of separately in the function argument of apply? Is this what you insinuated in your reply? THanking you, yours sincerely, AKSHAY M KULKARNI From: Rui Barradas Sent: Tuesday, November 8, 2022 2:20 AM To: akshay kulkarni ; R help Mailing list Subject: Re: [R] print and lapply Às 19:22 de 07/11/2022, akshay kulkarni escreveu: Dear Rui, THanks for your reply...The point is the loop is a scraping code, and in your examples you have assumed that the body acts on i, the loop variable. Can you adapt your code to JUST PRINT the loop variable i ? By the by, I think I have stumbled upon the answer: The lapply() caches the result, and prints the output of the function in question immediately after printing the final i. The i's get printed serially, as the function progresses lapply(1:4,function(x){print(x);Sys.sleep(x^2);x^2}) [1] 1 [1] 2 [1] 3 [1] 4 [[1]] [1] 1 [[2]] [1] 4 [[3]] [1] 9 [[4]] [1] 16 Here x^2 's print only after 4 is printed on the console tHanks anyways for your reply THanking you, Yours sincerely, AKSHAY M KULKARNI From: Rui Barradas Sent: Tuesday, November 8, 2022 12:24 AM To: akshay kulkarni ; R help Mailing list Subject: Re: [R] print and lapply Às 18:33 de 07/11/2022, akshay kulkarni escreveu: Dear Rui, Actually, I am replacing a big for loop by the lapply() function, and report the progress: lapply(TP, function(i) { BODY; print(i)}) Can you please adjust your solution in this light? THanking you, Yours sincerely, AKSHAY M KULKARNI From: Rui Barradas Sent: Monday, November 7, 2022 11:59 PM To: akshay kulkarni ; R help Mailing list Subject: Re: [R] print and lapply Às 17:17 de 07/11/2022, akshay kulkarni escreveu: Dear members, I have the following code and output: TP <- 1:4 lapply(TP,function(x){print(x);x^2}) [1] 1 [1] 2 [1] 3 [1] 4 [[1]] [1] 1 [[2]] [1] 4 [[3]] [1] 9 [[4]] [1] 16 How do I make the print function output x along with x^2, i.e not at the beginning but before each of x^2? Many thanks in advance THanking you, Yours sincerely AKSHAY M KULKARNI [[alternative HTML version deleted]] __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Hello, Here are two options, with ?cat and with ?message. TP <- 1:4 lapply(TP, function(x){ cat("x =", x, "x^2 =", x^2, "\n") }) lapply(TP, function(x){ msg <- paste("x =", x, "x^2 =", x^2) message(msg) }) Hope this helps, Rui Barradas Hello, What do you want the lapply loop to return? If you have a BODY doing computations, do you want the lapply to return those values and report the progress? I have chosen cat or message over print because - cat returns invisible(NULL), - message returns invisible() - print returns a value, what it prints. Can you adapt the code below to your use case? TP <- 1:4 lapply(TP, function(x, verbose = TRUE){ # BODY y <- rnorm(100, mean = x) # show progress if(verbose) cat("x =", x, "x^2 =", x^2, "\n") #return value c(x = x, mean = mean(y)) }) lapply(TP, function(x, verbose = TRUE){ # BODY y <- rnorm(100, mean = x) # show progress if(verbose) { msg <- paste("x =", x, "x^2 =", x^2) message(msg) } #return value c(x = x, mean = mean(y)) }) Hope this helps, Rui Barradas Hello, No, the x^2 are not printed after the i's. The x^2 are the function's return values. The function prints the i's, then returns x^2. As for your problem, it is now more clerar. I would write a function accepting a url to take care of scraping and call it in the lapply loop. The progress report can be in the loop, like below. This is a complete working example, scraping the Wikipedia list of countries by GDP. The urls are in a list (it's always the same, I'm not complicating things) and in a real scraping function I would wrap tryCatch around it, just in case. First the function, then the urls list, then the lapply loop. library(rvest) scrape <- function(url) { page <- read_html(url) gdp <- page |> html_element(".wikitable") |> html_table() |> as.data.frame() names(gdp) <- unlist(gdp[1,, drop = TRUE
Re: [R] print and lapply....
Dear Tim, I think the recent replies from you, Bert and Rui cleared everything ... THanks a lot.. Thanking you, Yours sincerely, AKSHAY M KULKARNI From: Ebert,Timothy Aaron Sent: Tuesday, November 8, 2022 2:15 AM To: akshay kulkarni ; Bert Gunter ; Andrew Simmons Cc: R help Mailing list Subject: RE: [R] print and lapply Dear Akshay, I think we have provided several solutions to the question asked. Can you please adjust your question to more closely align with what you need. It would be nice if you can provide sufficient detail so that we can see how you have adapted our solutions and how these have not quite addressed this problem. Tim -Original Message- From: R-help On Behalf Of akshay kulkarni Sent: Monday, November 7, 2022 1:10 PM To: Bert Gunter ; Andrew Simmons Cc: R help Mailing list Subject: Re: [R] print and lapply [External Email] Dear Bert, Actually, I am replacing a big for loop by the lapply() function, and report the progress: lapply(TP, function(i) { BODY; print(i)}) Can you please adjust your solution in this light? THanking you, Yours sincerely, AKSHAY M KULKARNI From: Bert Gunter Sent: Monday, November 7, 2022 11:16 PM To: Andrew Simmons Cc: akshay kulkarni ; R help Mailing list Subject: Re: [R] print and lapply Well... yes, of course. But assuming the sole purpose is to print the results and not to save them for further processing, the OP's approach seems rather painful. My preference would be to vectorize: > print(cbind(TP, TPsq =TP^2), print.gap = 3) TP TPsq [1,]1 1 [2,]2 4 [3,]3 9 [4,]4 16 See ?print.default for details -- Bert On Mon, Nov 7, 2022 at 9:20 AM Andrew Simmons wrote: > > put print() around x^2 > > On Mon, Nov 7, 2022, 12:18 akshay kulkarni wrote: > > > Dear members, > > I have the following code and output: > > > > > TP <- 1:4 > > > lapply(TP,function(x){print(x);x^2}) > > [1] 1 > > [1] 2 > > [1] 3 > > [1] 4 > > [[1]] > > [1] 1 > > > > [[2]] > > [1] 4 > > > > [[3]] > > [1] 9 > > > > [[4]] > > [1] 16 > > > > How do I make the print function output x along with x^2, i.e not at > > the beginning but before each of x^2? > > > > Many thanks in advance > > > > THanking you, > > Yours sincerely > > AKSHAY M KULKARNI > > > > [[alternative HTML version deleted]] > > > > __ > > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > > https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fst > > at.ethz.ch%2Fmailman%2Flistinfo%2Fr-helpdata=05%7C01%7Ctebert%4 > > 0ufl.edu%7Cb726a89349ed4860265708dac0eb5d0a%7C0d4da0f84a314d76ace60a > > 62331e1b84%7C0%7C0%7C638034414365456384%7CUnknown%7CTWFpbGZsb3d8eyJW > > IjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C300 > > 0%7C%7C%7Csdata=dQk1JPxWI4D0D6%2FSoC8LWw56749ulaFrGQc6affgBeM%3 > > Dreserved=0 > > PLEASE do read the posting guide > > https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww > > .r-project.org%2Fposting-guide.htmldata=05%7C01%7Ctebert%40ufl. > > edu%7Cb726a89349ed4860265708dac0eb5d0a%7C0d4da0f84a314d76ace60a62331 > > e1b84%7C0%7C0%7C638034414365456384%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiM > > C4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C% > > 7C%7Csdata=KDskHBxmxe0DV9XO7GvkESemUNTq2w%2BT%2Fro%2Bgb4DS2w%3D > > reserved=0 and provide commented, minimal, self-contained, > > reproducible code. > > > > [[alternative HTML version deleted]] > > __ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fstat > .ethz.ch%2Fmailman%2Flistinfo%2Fr-helpdata=05%7C01%7Ctebert%40ufl > .edu%7Cb726a89349ed4860265708dac0eb5d0a%7C0d4da0f84a314d76ace60a62331e > 1b84%7C0%7C0%7C638034414365456384%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4w > LjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C > sdata=dQk1JPxWI4D0D6%2FSoC8LWw56749ulaFrGQc6affgBeM%3Dreserv > ed=0 PLEASE do read the posting guide > https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.r > -project.org%2Fposting-guide.htmldata=05%7C01%7Ctebert%40ufl.edu% > 7Cb726a89349ed4860265708dac0eb5d0a%7C0d4da0f84a314d76ace60a62331e1b84% > 7C0%7C0%7C638034414365612626%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwM > DAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C > sdata=OxZmpA4ORbfUq0gq
Re: [R] print and lapply....
Dear Rui, The replies from you, Bert, Tim and solved my problem. My last question: what if I put print inside the body of the function passed on to lapply, instead of separately in the function argument of apply? Is this what you insinuated in your reply? THanking you, yours sincerely, AKSHAY M KULKARNI From: Rui Barradas Sent: Tuesday, November 8, 2022 2:20 AM To: akshay kulkarni ; R help Mailing list Subject: Re: [R] print and lapply �s 19:22 de 07/11/2022, akshay kulkarni escreveu: > Dear Rui, > THanks for your reply...The point is the loop is a scraping > code, and in your examples you have assumed that the body acts on i, the loop > variable. Can you adapt your code to JUST PRINT the loop variable i ? > > By the by, I think I have stumbled upon the answer: The lapply() caches the > result, and prints the output of the function in question immediately after > printing the final i. The i's get printed serially, as the function > progresses > >> lapply(1:4,function(x){print(x);Sys.sleep(x^2);x^2}) > [1] 1 > [1] 2 > [1] 3 > [1] 4 > [[1]] > [1] 1 > > [[2]] > [1] 4 > > [[3]] > [1] 9 > > [[4]] > [1] 16 > > Here x^2 's print only after 4 is printed on the console > > tHanks anyways for your reply > > THanking you, > Yours sincerely, > AKSHAY M KULKARNI > > From: Rui Barradas > Sent: Tuesday, November 8, 2022 12:24 AM > To: akshay kulkarni ; R help Mailing list > > Subject: Re: [R] print and lapply > > �s 18:33 de 07/11/2022, akshay kulkarni escreveu: >> Dear Rui, >> Actually, I am replacing a big for loop by the lapply() >> function, and report the progress: >> >> lapply(TP, function(i) { BODY; print(i)}) >> >> Can you please adjust your solution in this light? >> >> THanking you, >> Yours sincerely, >> AKSHAY M KULKARNI >> >> From: Rui Barradas >> Sent: Monday, November 7, 2022 11:59 PM >> To: akshay kulkarni ; R help Mailing list >> >> Subject: Re: [R] print and lapply >> >> �s 17:17 de 07/11/2022, akshay kulkarni escreveu: >>> Dear members, >>> I have the following code and output: >>> >>>> TP <- 1:4 >>>> lapply(TP,function(x){print(x);x^2}) >>> [1] 1 >>> [1] 2 >>> [1] 3 >>> [1] 4 >>> [[1]] >>> [1] 1 >>> >>> [[2]] >>> [1] 4 >>> >>> [[3]] >>> [1] 9 >>> >>> [[4]] >>> [1] 16 >>> >>> How do I make the print function output x along with x^2, i.e not at the >>> beginning but before each of x^2? >>> >>> Many thanks in advance >>> >>> THanking you, >>> Yours sincerely >>> AKSHAY M KULKARNI >>> >>> [[alternative HTML version deleted]] >>> >>> __ >>> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see >>> https://stat.ethz.ch/mailman/listinfo/r-help >>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html >>> and provide commented, minimal, self-contained, reproducible code. >> Hello, >> >> Here are two options, with ?cat and with ?message. >> >> >> TP <- 1:4 >> lapply(TP, function(x){ >> cat("x =", x, "x^2 =", x^2, "\n") >> }) >> >> lapply(TP, function(x){ >> msg <- paste("x =", x, "x^2 =", x^2) >> message(msg) >> }) >> >> >> Hope this helps, >> >> Rui Barradas >> >> >> > Hello, > > > What do you want the lapply loop to return? If you have a BODY doing > computations, do you want the lapply to return those values and report > the progress? > > I have chosen cat or message over print because > >- cat returns invisible(NULL), >- message returns invisible() >- print returns a value, what it prints. > > Can you adapt the code below to your use case? > > > > TP <- 1:4 > lapply(TP, function(x, verbose = TRUE){ > # BODY > y <- rnorm(100, mean = x) > > # show progress > if(verbose) > cat("x =", x, "x^2 =", x^2, "\n") > > #return value > c(x = x, mean = mean(y)) > }) > > lapply(TP, function(x, verbose = TRUE){ > # BODY > y <- rnorm(100,
Re: [R] print and lapply....
Dear Bert, Amazing! Very informative...THanks a lot. From: Bert Gunter Sent: Tuesday, November 8, 2022 2:15 AM To: akshay kulkarni Cc: Rui Barradas ; R help Mailing list Subject: Re: [R] print and lapply " The lapply() caches the result, and prints the output of the function in question immediately after printing the final i. " I don't believe you understand how lists or lapply works. You seem to be trying to intuit from empirical behavior. Bad idea, if so. You need to read the docs or spend time with suitable tutorials. Consider: lapply produces a **list,** each component of which is the result of applying a function, FUN, to the components of its first argument (here 1:4), which is itself a list. Results are **not** cached in the sense you seem to think they are. The list object that is produced by the function is **only** printed if you ask it to be (via cat, print, or whatever) or, by default, if the result is unassigned. The default printing can be turned off via the invisible() function. So: > res <- lapply(TP, function(x){ +print(x) +x^2} +) [1] 1 [1] 2 [1] 3 [1] 4 [1] 5 ## Nothing printed, but the results are the components of **list** res, which can be printed on the console by print(res) or simply: > res ## note the list syntax below [[1]] [1] 1 [[2]] [1] 4 [[3]] [1] 9 [[4]] [1] 16 [[5]] [1] 25 Now can you explain what happens here: > invisible(lapply(TP, function(x){ +print(x) +x^2} +)) [1] 1 [1] 2 [1] 3 [1] 4 [1] 5 > ## results not printed; nothing assigned. Where can you find them? (See below) or here: > lapply(TP, function(x){ +print(x) +x^2} +) [1] 1 [1] 2 [1] 3 [1] 4 [1] 5 [[1]] [1] 1 [[2]] [1] 4 [[3]] [1] 9 [[4]] [1] 16 [[5]] [1] 25 ## How could you recover the results of the lapply and not just look at the console printout if the results have not been assigned? ## Hint: See ?.Last.value -- Bert On Mon, Nov 7, 2022 at 11:22 AM akshay kulkarni wrote: > > Dear Rui, > THanks for your reply...The point is the loop is a scraping > code, and in your examples you have assumed that the body acts on i, the loop > variable. Can you adapt your code to JUST PRINT the loop variable i ? > > By the by, I think I have stumbled upon the answer: The lapply() caches the > result, and prints the output of the function in question immediately after > printing the final i. The i's get printed serially, as the function > progresses > > > lapply(1:4,function(x){print(x);Sys.sleep(x^2);x^2}) > [1] 1 > [1] 2 > [1] 3 > [1] 4 > [[1]] > [1] 1 > > [[2]] > [1] 4 > > [[3]] > [1] 9 > > [[4]] > [1] 16 > > Here x^2 's print only after 4 is printed on the console > > tHanks anyways for your reply > > THanking you, > Yours sincerely, > AKSHAY M KULKARNI > ____________ > From: Rui Barradas > Sent: Tuesday, November 8, 2022 12:24 AM > To: akshay kulkarni ; R help Mailing list > > Subject: Re: [R] print and lapply > > �s 18:33 de 07/11/2022, akshay kulkarni escreveu: > > Dear Rui, > > Actually, I am replacing a big for loop by the lapply() > > function, and report the progress: > > > > lapply(TP, function(i) { BODY; print(i)}) > > > > Can you please adjust your solution in this light? > > > > THanking you, > > Yours sincerely, > > AKSHAY M KULKARNI > > > > From: Rui Barradas > > Sent: Monday, November 7, 2022 11:59 PM > > To: akshay kulkarni ; R help Mailing list > > > > Subject: Re: [R] print and lapply > > > > �s 17:17 de 07/11/2022, akshay kulkarni escreveu: > >> Dear members, > >>I have the following code and output: > >> > >>> TP <- 1:4 > >>> lapply(TP,function(x){print(x);x^2}) > >> [1] 1 > >> [1] 2 > >> [1] 3 > >> [1] 4 > >> [[1]] > >> [1] 1 > >> > >> [[2]] > >> [1] 4 > >> > >> [[3]] > >> [1] 9 > >> > >> [[4]] > >> [1] 16 > >> > >> How do I make the print function output x along with x^2, i.e not at the > >> beginning but before each of x^2? > >> > >> Many thanks in advance > >> > >> THanking you, > >> Yours sincerely > >> AKSHAY M KULKARNI > >> > >> [[alternative HTML version deleted]] > >> > >> __ > >> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > >> https://stat.ethz.ch/mailm
Re: [R] print and lapply....
Às 19:22 de 07/11/2022, akshay kulkarni escreveu: Dear Rui, THanks for your reply...The point is the loop is a scraping code, and in your examples you have assumed that the body acts on i, the loop variable. Can you adapt your code to JUST PRINT the loop variable i ? By the by, I think I have stumbled upon the answer: The lapply() caches the result, and prints the output of the function in question immediately after printing the final i. The i's get printed serially, as the function progresses lapply(1:4,function(x){print(x);Sys.sleep(x^2);x^2}) [1] 1 [1] 2 [1] 3 [1] 4 [[1]] [1] 1 [[2]] [1] 4 [[3]] [1] 9 [[4]] [1] 16 Here x^2 's print only after 4 is printed on the console tHanks anyways for your reply THanking you, Yours sincerely, AKSHAY M KULKARNI From: Rui Barradas Sent: Tuesday, November 8, 2022 12:24 AM To: akshay kulkarni ; R help Mailing list Subject: Re: [R] print and lapply Às 18:33 de 07/11/2022, akshay kulkarni escreveu: Dear Rui, Actually, I am replacing a big for loop by the lapply() function, and report the progress: lapply(TP, function(i) { BODY; print(i)}) Can you please adjust your solution in this light? THanking you, Yours sincerely, AKSHAY M KULKARNI From: Rui Barradas Sent: Monday, November 7, 2022 11:59 PM To: akshay kulkarni ; R help Mailing list Subject: Re: [R] print and lapply Às 17:17 de 07/11/2022, akshay kulkarni escreveu: Dear members, I have the following code and output: TP <- 1:4 lapply(TP,function(x){print(x);x^2}) [1] 1 [1] 2 [1] 3 [1] 4 [[1]] [1] 1 [[2]] [1] 4 [[3]] [1] 9 [[4]] [1] 16 How do I make the print function output x along with x^2, i.e not at the beginning but before each of x^2? Many thanks in advance THanking you, Yours sincerely AKSHAY M KULKARNI [[alternative HTML version deleted]] __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Hello, Here are two options, with ?cat and with ?message. TP <- 1:4 lapply(TP, function(x){ cat("x =", x, "x^2 =", x^2, "\n") }) lapply(TP, function(x){ msg <- paste("x =", x, "x^2 =", x^2) message(msg) }) Hope this helps, Rui Barradas Hello, What do you want the lapply loop to return? If you have a BODY doing computations, do you want the lapply to return those values and report the progress? I have chosen cat or message over print because - cat returns invisible(NULL), - message returns invisible() - print returns a value, what it prints. Can you adapt the code below to your use case? TP <- 1:4 lapply(TP, function(x, verbose = TRUE){ # BODY y <- rnorm(100, mean = x) # show progress if(verbose) cat("x =", x, "x^2 =", x^2, "\n") #return value c(x = x, mean = mean(y)) }) lapply(TP, function(x, verbose = TRUE){ # BODY y <- rnorm(100, mean = x) # show progress if(verbose) { msg <- paste("x =", x, "x^2 =", x^2) message(msg) } #return value c(x = x, mean = mean(y)) }) Hope this helps, Rui Barradas Hello, No, the x^2 are not printed after the i's. The x^2 are the function's return values. The function prints the i's, then returns x^2. As for your problem, it is now more clerar. I would write a function accepting a url to take care of scraping and call it in the lapply loop. The progress report can be in the loop, like below. This is a complete working example, scraping the Wikipedia list of countries by GDP. The urls are in a list (it's always the same, I'm not complicating things) and in a real scraping function I would wrap tryCatch around it, just in case. First the function, then the urls list, then the lapply loop. library(rvest) scrape <- function(url) { page <- read_html(url) gdp <- page |> html_element(".wikitable") |> html_table() |> as.data.frame() names(gdp) <- unlist(gdp[1,, drop = TRUE]) gdp <- gdp[-1,] row.names(gdp) <- NULL #return value gdp } wiki_gdp_url <- "https://en.wikipedia.org/wiki/List_of_countries_by_GDP_(nominal)" urls_list <- list(wiki_gdp_url, wiki_gdp_url) TP <- seq_along(urls_list) TP # [1] 1 2 df_list <- lapply(TP, \(i) { URL <- urls_list[[i]] data <- scrape(URL) # show progress message("iteration: ", i) #return value data }) str(df_list) Hope this helps, Rui Barradas __ R-help@r-project.org mailing list -- To UNSUBSCRIBE
Re: [R] print and lapply....
Dear Akshay, I think we have provided several solutions to the question asked. Can you please adjust your question to more closely align with what you need. It would be nice if you can provide sufficient detail so that we can see how you have adapted our solutions and how these have not quite addressed this problem. Tim -Original Message- From: R-help On Behalf Of akshay kulkarni Sent: Monday, November 7, 2022 1:10 PM To: Bert Gunter ; Andrew Simmons Cc: R help Mailing list Subject: Re: [R] print and lapply [External Email] Dear Bert, Actually, I am replacing a big for loop by the lapply() function, and report the progress: lapply(TP, function(i) { BODY; print(i)}) Can you please adjust your solution in this light? THanking you, Yours sincerely, AKSHAY M KULKARNI From: Bert Gunter Sent: Monday, November 7, 2022 11:16 PM To: Andrew Simmons Cc: akshay kulkarni ; R help Mailing list Subject: Re: [R] print and lapply Well... yes, of course. But assuming the sole purpose is to print the results and not to save them for further processing, the OP's approach seems rather painful. My preference would be to vectorize: > print(cbind(TP, TPsq =TP^2), print.gap = 3) TP TPsq [1,]1 1 [2,]2 4 [3,]3 9 [4,]4 16 See ?print.default for details -- Bert On Mon, Nov 7, 2022 at 9:20 AM Andrew Simmons wrote: > > put print() around x^2 > > On Mon, Nov 7, 2022, 12:18 akshay kulkarni wrote: > > > Dear members, > > I have the following code and output: > > > > > TP <- 1:4 > > > lapply(TP,function(x){print(x);x^2}) > > [1] 1 > > [1] 2 > > [1] 3 > > [1] 4 > > [[1]] > > [1] 1 > > > > [[2]] > > [1] 4 > > > > [[3]] > > [1] 9 > > > > [[4]] > > [1] 16 > > > > How do I make the print function output x along with x^2, i.e not at > > the beginning but before each of x^2? > > > > Many thanks in advance > > > > THanking you, > > Yours sincerely > > AKSHAY M KULKARNI > > > > [[alternative HTML version deleted]] > > > > __ > > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > > https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fst > > at.ethz.ch%2Fmailman%2Flistinfo%2Fr-helpdata=05%7C01%7Ctebert%4 > > 0ufl.edu%7Cb726a89349ed4860265708dac0eb5d0a%7C0d4da0f84a314d76ace60a > > 62331e1b84%7C0%7C0%7C638034414365456384%7CUnknown%7CTWFpbGZsb3d8eyJW > > IjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C300 > > 0%7C%7C%7Csdata=dQk1JPxWI4D0D6%2FSoC8LWw56749ulaFrGQc6affgBeM%3 > > Dreserved=0 > > PLEASE do read the posting guide > > https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww > > .r-project.org%2Fposting-guide.htmldata=05%7C01%7Ctebert%40ufl. > > edu%7Cb726a89349ed4860265708dac0eb5d0a%7C0d4da0f84a314d76ace60a62331 > > e1b84%7C0%7C0%7C638034414365456384%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiM > > C4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C% > > 7C%7Csdata=KDskHBxmxe0DV9XO7GvkESemUNTq2w%2BT%2Fro%2Bgb4DS2w%3D > > reserved=0 and provide commented, minimal, self-contained, > > reproducible code. > > > > [[alternative HTML version deleted]] > > __ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fstat > .ethz.ch%2Fmailman%2Flistinfo%2Fr-helpdata=05%7C01%7Ctebert%40ufl > .edu%7Cb726a89349ed4860265708dac0eb5d0a%7C0d4da0f84a314d76ace60a62331e > 1b84%7C0%7C0%7C638034414365456384%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4w > LjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C > sdata=dQk1JPxWI4D0D6%2FSoC8LWw56749ulaFrGQc6affgBeM%3Dreserv > ed=0 PLEASE do read the posting guide > https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.r > -project.org%2Fposting-guide.htmldata=05%7C01%7Ctebert%40ufl.edu% > 7Cb726a89349ed4860265708dac0eb5d0a%7C0d4da0f84a314d76ace60a62331e1b84% > 7C0%7C0%7C638034414365612626%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwM > DAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C > sdata=OxZmpA4ORbfUq0gqM8ebZvK5bQTaiCwo0Y1ekn%2F3zBE%3Dreserved=0 > and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]] __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fstat.ethz.ch%2Fmailman%2Flistinfo%2Fr-help
Re: [R] print and lapply....
" The lapply() caches the result, and prints the output of the function in question immediately after printing the final i. " I don't believe you understand how lists or lapply works. You seem to be trying to intuit from empirical behavior. Bad idea, if so. You need to read the docs or spend time with suitable tutorials. Consider: lapply produces a **list,** each component of which is the result of applying a function, FUN, to the components of its first argument (here 1:4), which is itself a list. Results are **not** cached in the sense you seem to think they are. The list object that is produced by the function is **only** printed if you ask it to be (via cat, print, or whatever) or, by default, if the result is unassigned. The default printing can be turned off via the invisible() function. So: > res <- lapply(TP, function(x){ +print(x) +x^2} +) [1] 1 [1] 2 [1] 3 [1] 4 [1] 5 ## Nothing printed, but the results are the components of **list** res, which can be printed on the console by print(res) or simply: > res ## note the list syntax below [[1]] [1] 1 [[2]] [1] 4 [[3]] [1] 9 [[4]] [1] 16 [[5]] [1] 25 Now can you explain what happens here: > invisible(lapply(TP, function(x){ +print(x) +x^2} +)) [1] 1 [1] 2 [1] 3 [1] 4 [1] 5 > ## results not printed; nothing assigned. Where can you find them? (See below) or here: > lapply(TP, function(x){ +print(x) +x^2} +) [1] 1 [1] 2 [1] 3 [1] 4 [1] 5 [[1]] [1] 1 [[2]] [1] 4 [[3]] [1] 9 [[4]] [1] 16 [[5]] [1] 25 ## How could you recover the results of the lapply and not just look at the console printout if the results have not been assigned? ## Hint: See ?.Last.value -- Bert On Mon, Nov 7, 2022 at 11:22 AM akshay kulkarni wrote: > > Dear Rui, > THanks for your reply...The point is the loop is a scraping > code, and in your examples you have assumed that the body acts on i, the loop > variable. Can you adapt your code to JUST PRINT the loop variable i ? > > By the by, I think I have stumbled upon the answer: The lapply() caches the > result, and prints the output of the function in question immediately after > printing the final i. The i's get printed serially, as the function > progresses > > > lapply(1:4,function(x){print(x);Sys.sleep(x^2);x^2}) > [1] 1 > [1] 2 > [1] 3 > [1] 4 > [[1]] > [1] 1 > > [[2]] > [1] 4 > > [[3]] > [1] 9 > > [[4]] > [1] 16 > > Here x^2 's print only after 4 is printed on the console > > tHanks anyways for your reply > > THanking you, > Yours sincerely, > AKSHAY M KULKARNI > ____________ > From: Rui Barradas > Sent: Tuesday, November 8, 2022 12:24 AM > To: akshay kulkarni ; R help Mailing list > > Subject: Re: [R] print and lapply > > Às 18:33 de 07/11/2022, akshay kulkarni escreveu: > > Dear Rui, > > Actually, I am replacing a big for loop by the lapply() > > function, and report the progress: > > > > lapply(TP, function(i) { BODY; print(i)}) > > > > Can you please adjust your solution in this light? > > > > THanking you, > > Yours sincerely, > > AKSHAY M KULKARNI > > > > From: Rui Barradas > > Sent: Monday, November 7, 2022 11:59 PM > > To: akshay kulkarni ; R help Mailing list > > > > Subject: Re: [R] print and lapply > > > > Às 17:17 de 07/11/2022, akshay kulkarni escreveu: > >> Dear members, > >>I have the following code and output: > >> > >>> TP <- 1:4 > >>> lapply(TP,function(x){print(x);x^2}) > >> [1] 1 > >> [1] 2 > >> [1] 3 > >> [1] 4 > >> [[1]] > >> [1] 1 > >> > >> [[2]] > >> [1] 4 > >> > >> [[3]] > >> [1] 9 > >> > >> [[4]] > >> [1] 16 > >> > >> How do I make the print function output x along with x^2, i.e not at the > >> beginning but before each of x^2? > >> > >> Many thanks in advance > >> > >> THanking you, > >> Yours sincerely > >> AKSHAY M KULKARNI > >> > >> [[alternative HTML version deleted]] > >> > >> __ > >> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > >> https://stat.ethz.ch/mailman/listinfo/r-help > >> PLEASE do read the posting guide > >> http://www.R-project.org/posting-guide.html > >> and provide commented, minimal, self-contained, reproducible code. > > Hello, > > > > Here are two options, with
Re: [R] print and lapply....
Dear Rui, THanks for your reply...The point is the loop is a scraping code, and in your examples you have assumed that the body acts on i, the loop variable. Can you adapt your code to JUST PRINT the loop variable i ? By the by, I think I have stumbled upon the answer: The lapply() caches the result, and prints the output of the function in question immediately after printing the final i. The i's get printed serially, as the function progresses > lapply(1:4,function(x){print(x);Sys.sleep(x^2);x^2}) [1] 1 [1] 2 [1] 3 [1] 4 [[1]] [1] 1 [[2]] [1] 4 [[3]] [1] 9 [[4]] [1] 16 Here x^2 's print only after 4 is printed on the console tHanks anyways for your reply THanking you, Yours sincerely, AKSHAY M KULKARNI From: Rui Barradas Sent: Tuesday, November 8, 2022 12:24 AM To: akshay kulkarni ; R help Mailing list Subject: Re: [R] print and lapply �s 18:33 de 07/11/2022, akshay kulkarni escreveu: > Dear Rui, > Actually, I am replacing a big for loop by the lapply() > function, and report the progress: > > lapply(TP, function(i) { BODY; print(i)}) > > Can you please adjust your solution in this light? > > THanking you, > Yours sincerely, > AKSHAY M KULKARNI > > From: Rui Barradas > Sent: Monday, November 7, 2022 11:59 PM > To: akshay kulkarni ; R help Mailing list > > Subject: Re: [R] print and lapply > > �s 17:17 de 07/11/2022, akshay kulkarni escreveu: >> Dear members, >>I have the following code and output: >> >>> TP <- 1:4 >>> lapply(TP,function(x){print(x);x^2}) >> [1] 1 >> [1] 2 >> [1] 3 >> [1] 4 >> [[1]] >> [1] 1 >> >> [[2]] >> [1] 4 >> >> [[3]] >> [1] 9 >> >> [[4]] >> [1] 16 >> >> How do I make the print function output x along with x^2, i.e not at the >> beginning but before each of x^2? >> >> Many thanks in advance >> >> THanking you, >> Yours sincerely >> AKSHAY M KULKARNI >> >> [[alternative HTML version deleted]] >> >> __ >> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html >> and provide commented, minimal, self-contained, reproducible code. > Hello, > > Here are two options, with ?cat and with ?message. > > > TP <- 1:4 > lapply(TP, function(x){ > cat("x =", x, "x^2 =", x^2, "\n") > }) > > lapply(TP, function(x){ > msg <- paste("x =", x, "x^2 =", x^2) > message(msg) > }) > > > Hope this helps, > > Rui Barradas > > > Hello, What do you want the lapply loop to return? If you have a BODY doing computations, do you want the lapply to return those values and report the progress? I have chosen cat or message over print because - cat returns invisible(NULL), - message returns invisible() - print returns a value, what it prints. Can you adapt the code below to your use case? TP <- 1:4 lapply(TP, function(x, verbose = TRUE){ # BODY y <- rnorm(100, mean = x) # show progress if(verbose) cat("x =", x, "x^2 =", x^2, "\n") #return value c(x = x, mean = mean(y)) }) lapply(TP, function(x, verbose = TRUE){ # BODY y <- rnorm(100, mean = x) # show progress if(verbose) { msg <- paste("x =", x, "x^2 =", x^2) message(msg) } #return value c(x = x, mean = mean(y)) }) Hope this helps, Rui Barradas [[alternative HTML version deleted]] __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] print and lapply....
Às 18:33 de 07/11/2022, akshay kulkarni escreveu: Dear Rui, Actually, I am replacing a big for loop by the lapply() function, and report the progress: lapply(TP, function(i) { BODY; print(i)}) Can you please adjust your solution in this light? THanking you, Yours sincerely, AKSHAY M KULKARNI From: Rui Barradas Sent: Monday, November 7, 2022 11:59 PM To: akshay kulkarni ; R help Mailing list Subject: Re: [R] print and lapply Às 17:17 de 07/11/2022, akshay kulkarni escreveu: Dear members, I have the following code and output: TP <- 1:4 lapply(TP,function(x){print(x);x^2}) [1] 1 [1] 2 [1] 3 [1] 4 [[1]] [1] 1 [[2]] [1] 4 [[3]] [1] 9 [[4]] [1] 16 How do I make the print function output x along with x^2, i.e not at the beginning but before each of x^2? Many thanks in advance THanking you, Yours sincerely AKSHAY M KULKARNI [[alternative HTML version deleted]] __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Hello, Here are two options, with ?cat and with ?message. TP <- 1:4 lapply(TP, function(x){ cat("x =", x, "x^2 =", x^2, "\n") }) lapply(TP, function(x){ msg <- paste("x =", x, "x^2 =", x^2) message(msg) }) Hope this helps, Rui Barradas Hello, What do you want the lapply loop to return? If you have a BODY doing computations, do you want the lapply to return those values and report the progress? I have chosen cat or message over print because - cat returns invisible(NULL), - message returns invisible() - print returns a value, what it prints. Can you adapt the code below to your use case? TP <- 1:4 lapply(TP, function(x, verbose = TRUE){ # BODY y <- rnorm(100, mean = x) # show progress if(verbose) cat("x =", x, "x^2 =", x^2, "\n") #return value c(x = x, mean = mean(y)) }) lapply(TP, function(x, verbose = TRUE){ # BODY y <- rnorm(100, mean = x) # show progress if(verbose) { msg <- paste("x =", x, "x^2 =", x^2) message(msg) } #return value c(x = x, mean = mean(y)) }) Hope this helps, Rui Barradas __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] print and lapply....
Dear Rui, Actually, I am replacing a big for loop by the lapply() function, and report the progress: lapply(TP, function(i) { BODY; print(i)}) Can you please adjust your solution in this light? THanking you, Yours sincerely, AKSHAY M KULKARNI From: Rui Barradas Sent: Monday, November 7, 2022 11:59 PM To: akshay kulkarni ; R help Mailing list Subject: Re: [R] print and lapply �s 17:17 de 07/11/2022, akshay kulkarni escreveu: > Dear members, > I have the following code and output: > >> TP <- 1:4 >> lapply(TP,function(x){print(x);x^2}) > [1] 1 > [1] 2 > [1] 3 > [1] 4 > [[1]] > [1] 1 > > [[2]] > [1] 4 > > [[3]] > [1] 9 > > [[4]] > [1] 16 > > How do I make the print function output x along with x^2, i.e not at the > beginning but before each of x^2? > > Many thanks in advance > > THanking you, > Yours sincerely > AKSHAY M KULKARNI > >[[alternative HTML version deleted]] > > __ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. Hello, Here are two options, with ?cat and with ?message. TP <- 1:4 lapply(TP, function(x){ cat("x =", x, "x^2 =", x^2, "\n") }) lapply(TP, function(x){ msg <- paste("x =", x, "x^2 =", x^2) message(msg) }) Hope this helps, Rui Barradas [[alternative HTML version deleted]] __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] print and lapply....
Às 17:17 de 07/11/2022, akshay kulkarni escreveu: Dear members, I have the following code and output: TP <- 1:4 lapply(TP,function(x){print(x);x^2}) [1] 1 [1] 2 [1] 3 [1] 4 [[1]] [1] 1 [[2]] [1] 4 [[3]] [1] 9 [[4]] [1] 16 How do I make the print function output x along with x^2, i.e not at the beginning but before each of x^2? Many thanks in advance THanking you, Yours sincerely AKSHAY M KULKARNI [[alternative HTML version deleted]] __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Hello, Here are two options, with ?cat and with ?message. TP <- 1:4 lapply(TP, function(x){ cat("x =", x, "x^2 =", x^2, "\n") }) lapply(TP, function(x){ msg <- paste("x =", x, "x^2 =", x^2) message(msg) }) Hope this helps, Rui Barradas __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] print and lapply....
Dear Bert, Actually, I am replacing a big for loop by the lapply() function, and report the progress: lapply(TP, function(i) { BODY; print(i)}) Can you please adjust your solution in this light? THanking you, Yours sincerely, AKSHAY M KULKARNI From: Bert Gunter Sent: Monday, November 7, 2022 11:16 PM To: Andrew Simmons Cc: akshay kulkarni ; R help Mailing list Subject: Re: [R] print and lapply Well... yes, of course. But assuming the sole purpose is to print the results and not to save them for further processing, the OP's approach seems rather painful. My preference would be to vectorize: > print(cbind(TP, TPsq =TP^2), print.gap = 3) TP TPsq [1,]1 1 [2,]2 4 [3,]3 9 [4,]4 16 See ?print.default for details -- Bert On Mon, Nov 7, 2022 at 9:20 AM Andrew Simmons wrote: > > put print() around x^2 > > On Mon, Nov 7, 2022, 12:18 akshay kulkarni wrote: > > > Dear members, > > I have the following code and output: > > > > > TP <- 1:4 > > > lapply(TP,function(x){print(x);x^2}) > > [1] 1 > > [1] 2 > > [1] 3 > > [1] 4 > > [[1]] > > [1] 1 > > > > [[2]] > > [1] 4 > > > > [[3]] > > [1] 9 > > > > [[4]] > > [1] 16 > > > > How do I make the print function output x along with x^2, i.e not at the > > beginning but before each of x^2? > > > > Many thanks in advance > > > > THanking you, > > Yours sincerely > > AKSHAY M KULKARNI > > > > [[alternative HTML version deleted]] > > > > __ > > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide > > http://www.R-project.org/posting-guide.html > > and provide commented, minimal, self-contained, reproducible code. > > > > [[alternative HTML version deleted]] > > __ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]] __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] print and lapply....
I meant something like: TP <- 1:4 lapply(TP, function(x) { print(x) print(x^2) }) You may wish to add cat("\n") after print(x^2) so that your results from each iteration are separated. You may also wish to add invisible() around lapply() if you're not saving / / using the return list in any way. On Mon, Nov 7, 2022 at 12:38 PM akshay kulkarni wrote: > > Dear Andrew > It doesn't work: > > > lapply(TP,function(x){print(x^2)}) > [1] 1 > [1] 4 > [1] 9 > [1] 16 > [[1]] > [1] 1 > > [[2]] > [1] 4 > > [[3]] > [1] 9 > > [[4]] > [1] 16 > > Basically, lapply() is implemented by a for loop. So there must be some way > right? > > tHanking you, > Yours sincerely, > AKSHAY M KULKARNI > > From: Andrew Simmons > Sent: Monday, November 7, 2022 10:50 PM > To: akshay kulkarni > Cc: R help Mailing list > Subject: Re: [R] print and lapply > > put print() around x^2 > > On Mon, Nov 7, 2022, 12:18 akshay kulkarni wrote: > > Dear members, > I have the following code and output: > > > TP <- 1:4 > > lapply(TP,function(x){print(x);x^2}) > [1] 1 > [1] 2 > [1] 3 > [1] 4 > [[1]] > [1] 1 > > [[2]] > [1] 4 > > [[3]] > [1] 9 > > [[4]] > [1] 16 > > How do I make the print function output x along with x^2, i.e not at the > beginning but before each of x^2? > > Many thanks in advance > > THanking you, > Yours sincerely > AKSHAY M KULKARNI > > [[alternative HTML version deleted]] > > __ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] print and lapply....
Dear Tim, Actually, I am replacing a big for loop by the lapply() function, and report the progress: lapply(TP, function(i) { BODY; print(i)}) Can you please adjust your solution in this light? THanking you, Yours sincerely, AKSHAY M KULKARNI From: Ebert,Timothy Aaron Sent: Monday, November 7, 2022 11:07 PM To: Andrew Simmons ; akshay kulkarni Cc: R help Mailing list Subject: RE: [R] print and lapply Another option is use paste() within print() lapply(TP,function(x){print(paste("x= ",x, " x^2 = ", x^2))}) Tim -Original Message- From: R-help On Behalf Of Andrew Simmons Sent: Monday, November 7, 2022 12:21 PM To: akshay kulkarni Cc: R help Mailing list Subject: Re: [R] print and lapply [External Email] put print() around x^2 On Mon, Nov 7, 2022, 12:18 akshay kulkarni wrote: > Dear members, > I have the following code and output: > > > TP <- 1:4 > > lapply(TP,function(x){print(x);x^2}) > [1] 1 > [1] 2 > [1] 3 > [1] 4 > [[1]] > [1] 1 > > [[2]] > [1] 4 > > [[3]] > [1] 9 > > [[4]] > [1] 16 > > How do I make the print function output x along with x^2, i.e not at > the beginning but before each of x^2? > > Many thanks in advance > > THanking you, > Yours sincerely > AKSHAY M KULKARNI > > [[alternative HTML version deleted]] > > __ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fstat > .ethz.ch%2Fmailman%2Flistinfo%2Fr-helpdata=05%7C01%7Ctebert%40ufl > .edu%7C28ae59febb2d43ce03b108dac0e46e79%7C0d4da0f84a314d76ace60a62331e > 1b84%7C0%7C0%7C638034384601744085%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4w > LjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C > sdata=1D8FQ07q2NcYL8PaJW84PqdUAte3pZJy8XJuJXENbJ4%3Dreserved > =0 > PLEASE do read the posting guide > https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.r > -project.org%2Fposting-guide.htmldata=05%7C01%7Ctebert%40ufl.edu% > 7C28ae59febb2d43ce03b108dac0e46e79%7C0d4da0f84a314d76ace60a62331e1b84% > 7C0%7C0%7C638034384601744085%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwM > DAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C > sdata=aEeZJ8FHVKGX%2BqOJaKskC1onjqKcON2Ux5cj3MimTGw%3Dreserved=0 > and provide commented, minimal, self-contained, reproducible code. > [[alternative HTML version deleted]] __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fstat.ethz.ch%2Fmailman%2Flistinfo%2Fr-helpdata=05%7C01%7Ctebert%40ufl.edu%7C28ae59febb2d43ce03b108dac0e46e79%7C0d4da0f84a314d76ace60a62331e1b84%7C0%7C0%7C638034384601744085%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7Csdata=1D8FQ07q2NcYL8PaJW84PqdUAte3pZJy8XJuJXENbJ4%3Dreserved=0 PLEASE do read the posting guide https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.r-project.org%2Fposting-guide.htmldata=05%7C01%7Ctebert%40ufl.edu%7C28ae59febb2d43ce03b108dac0e46e79%7C0d4da0f84a314d76ace60a62331e1b84%7C0%7C0%7C638034384601744085%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7Csdata=aEeZJ8FHVKGX%2BqOJaKskC1onjqKcON2Ux5cj3MimTGw%3Dreserved=0 and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]] __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] print and lapply....
Well... yes, of course. But assuming the sole purpose is to print the results and not to save them for further processing, the OP's approach seems rather painful. My preference would be to vectorize: > print(cbind(TP, TPsq =TP^2), print.gap = 3) TP TPsq [1,]1 1 [2,]2 4 [3,]3 9 [4,]4 16 See ?print.default for details -- Bert On Mon, Nov 7, 2022 at 9:20 AM Andrew Simmons wrote: > > put print() around x^2 > > On Mon, Nov 7, 2022, 12:18 akshay kulkarni wrote: > > > Dear members, > > I have the following code and output: > > > > > TP <- 1:4 > > > lapply(TP,function(x){print(x);x^2}) > > [1] 1 > > [1] 2 > > [1] 3 > > [1] 4 > > [[1]] > > [1] 1 > > > > [[2]] > > [1] 4 > > > > [[3]] > > [1] 9 > > > > [[4]] > > [1] 16 > > > > How do I make the print function output x along with x^2, i.e not at the > > beginning but before each of x^2? > > > > Many thanks in advance > > > > THanking you, > > Yours sincerely > > AKSHAY M KULKARNI > > > > [[alternative HTML version deleted]] > > > > __ > > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide > > http://www.R-project.org/posting-guide.html > > and provide commented, minimal, self-contained, reproducible code. > > > > [[alternative HTML version deleted]] > > __ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] print and lapply....
Dear Andrew It doesn't work: > lapply(TP,function(x){print(x^2)}) [1] 1 [1] 4 [1] 9 [1] 16 [[1]] [1] 1 [[2]] [1] 4 [[3]] [1] 9 [[4]] [1] 16 Basically, lapply() is implemented by a for loop. So there must be some way right? tHanking you, Yours sincerely, AKSHAY M KULKARNI From: Andrew Simmons Sent: Monday, November 7, 2022 10:50 PM To: akshay kulkarni Cc: R help Mailing list Subject: Re: [R] print and lapply put print() around x^2 On Mon, Nov 7, 2022, 12:18 akshay kulkarni mailto:akshay...@hotmail.com>> wrote: Dear members, I have the following code and output: > TP <- 1:4 > lapply(TP,function(x){print(x);x^2}) [1] 1 [1] 2 [1] 3 [1] 4 [[1]] [1] 1 [[2]] [1] 4 [[3]] [1] 9 [[4]] [1] 16 How do I make the print function output x along with x^2, i.e not at the beginning but before each of x^2? Many thanks in advance THanking you, Yours sincerely AKSHAY M KULKARNI [[alternative HTML version deleted]] __ R-help@r-project.org<mailto:R-help@r-project.org> mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]] __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] print and lapply....
Another option is use paste() within print() lapply(TP,function(x){print(paste("x= ",x, " x^2 = ", x^2))}) Tim -Original Message- From: R-help On Behalf Of Andrew Simmons Sent: Monday, November 7, 2022 12:21 PM To: akshay kulkarni Cc: R help Mailing list Subject: Re: [R] print and lapply [External Email] put print() around x^2 On Mon, Nov 7, 2022, 12:18 akshay kulkarni wrote: > Dear members, > I have the following code and output: > > > TP <- 1:4 > > lapply(TP,function(x){print(x);x^2}) > [1] 1 > [1] 2 > [1] 3 > [1] 4 > [[1]] > [1] 1 > > [[2]] > [1] 4 > > [[3]] > [1] 9 > > [[4]] > [1] 16 > > How do I make the print function output x along with x^2, i.e not at > the beginning but before each of x^2? > > Many thanks in advance > > THanking you, > Yours sincerely > AKSHAY M KULKARNI > > [[alternative HTML version deleted]] > > __ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fstat > .ethz.ch%2Fmailman%2Flistinfo%2Fr-helpdata=05%7C01%7Ctebert%40ufl > .edu%7C28ae59febb2d43ce03b108dac0e46e79%7C0d4da0f84a314d76ace60a62331e > 1b84%7C0%7C0%7C638034384601744085%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4w > LjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C > sdata=1D8FQ07q2NcYL8PaJW84PqdUAte3pZJy8XJuJXENbJ4%3Dreserved > =0 > PLEASE do read the posting guide > https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.r > -project.org%2Fposting-guide.htmldata=05%7C01%7Ctebert%40ufl.edu% > 7C28ae59febb2d43ce03b108dac0e46e79%7C0d4da0f84a314d76ace60a62331e1b84% > 7C0%7C0%7C638034384601744085%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwM > DAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C > sdata=aEeZJ8FHVKGX%2BqOJaKskC1onjqKcON2Ux5cj3MimTGw%3Dreserved=0 > and provide commented, minimal, self-contained, reproducible code. > [[alternative HTML version deleted]] __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fstat.ethz.ch%2Fmailman%2Flistinfo%2Fr-helpdata=05%7C01%7Ctebert%40ufl.edu%7C28ae59febb2d43ce03b108dac0e46e79%7C0d4da0f84a314d76ace60a62331e1b84%7C0%7C0%7C638034384601744085%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7Csdata=1D8FQ07q2NcYL8PaJW84PqdUAte3pZJy8XJuJXENbJ4%3Dreserved=0 PLEASE do read the posting guide https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.r-project.org%2Fposting-guide.htmldata=05%7C01%7Ctebert%40ufl.edu%7C28ae59febb2d43ce03b108dac0e46e79%7C0d4da0f84a314d76ace60a62331e1b84%7C0%7C0%7C638034384601744085%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7Csdata=aEeZJ8FHVKGX%2BqOJaKskC1onjqKcON2Ux5cj3MimTGw%3Dreserved=0 and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] print and lapply....
put print() around x^2 On Mon, Nov 7, 2022, 12:18 akshay kulkarni wrote: > Dear members, > I have the following code and output: > > > TP <- 1:4 > > lapply(TP,function(x){print(x);x^2}) > [1] 1 > [1] 2 > [1] 3 > [1] 4 > [[1]] > [1] 1 > > [[2]] > [1] 4 > > [[3]] > [1] 9 > > [[4]] > [1] 16 > > How do I make the print function output x along with x^2, i.e not at the > beginning but before each of x^2? > > Many thanks in advance > > THanking you, > Yours sincerely > AKSHAY M KULKARNI > > [[alternative HTML version deleted]] > > __ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > [[alternative HTML version deleted]] __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.