Re: [R] Using lapply in R data table

Frank S. De: Bert Gunter <bgunter.4...@gmail.com> Enviat el: dilluns, 26 de setembre de 2016 23:18:52 Per a: Ista Zahn A/c: Frank S.; r-help@r-project.org Tema: Re: [R] Using lapply in R data table ... and just for fun, here's an alternative in which mapply() is used to

Re: [R] Using lapply in R data table

... and just for fun, here's an alternative in which mapply() is used to vectorize switch(); again, whether you like it may be just a matter of taste, although I suspect it might be less efficient than ifelse(), which is already vectorized: DT <- within(DT, exposure <- {

Re: [R] Using lapply in R data table

Ista: Aha -- now I see the point. My bad. You are right. I was careless. However, cut() with ifelse() might simplify the code a bit and/or make it more readable. To be clear, this is just a matter of taste; e.g. using your data and a data frame instead of a data table: > DT <- within(DT,

Re: [R] Using lapply in R data table

On Mon, Sep 26, 2016 at 2:48 PM, Bert Gunter wrote: > I thought that that was a typo from the OP, as it disagrees with his > example. But the labels are arbitrary, so in fact cut() will do it > whichever way he meant. I don't see how cut will do it, at least not

Re: [R] Using lapply in R data table

I thought that that was a typo from the OP, as it disagrees with his example. But the labels are arbitrary, so in fact cut() will do it whichever way he meant. -- Bert Bert Gunter "The trouble with having an open mind is that people keep coming along and sticking things into it." -- Opus (aka

Re: [R] Using lapply in R data table

On Mon, Sep 26, 2016 at 1:59 PM, Bert Gunter wrote: > This seems like a job for cut() . I thought that at first two, but the middle group shouldn't be .87 but rather exposure" = "2007-01-01" - "fini" so, I think cut alone won't do it. Best, Ista > > (I made DT a data

Re: [R] Using lapply in R data table

This seems like a job for cut() . (I made DT a data frame to avoid loading the data table package. But I assume it would work with a data table too, Check this, though!) > DT <- within(DT, exposure <- > cut(fini,as.Date(c("2000-01-01","2006-01-01","2006-06-30","2006-12-21")), > labels=

Re: [R] Using lapply in R data table

Hi Frank, lapply(DT) iterates over each column. That doesn't seem to be what you want. There are probably better ways, but here is one approach. DT[, exposure := vector(mode = "numeric", length = .N)] DT[fini < as.Date("2006-01-01"), exposure := 1] DT[fini >= as.Date("2006-01-01") & fini <=

[R] Using lapply in R data table

Dear all, I have a R data table like this: DT <- data.table( id = rep(c(2, 5, 7), c(3, 2, 2)), fini = rep(as.Date(c('2005-04-20', '2006-02-19', '2006-10-08')), c(3, 2, 2)), group = rep(c("A", "B", "A"), c(3, 2, 2)) ) I want to construct a new variable "exposure" defined as follows: 1)

[R] Using lapply or mapply

Hi Team, I am new to using apply function in R. I want to find out the empirical quantiles of all items in a list. ## Fitting Kernal Density function Emp_Marginals<-apply(M_Diff_Final,2,kde) ### Simulated variables

Re: [R] Using lapply when there are dependencies

For loops are not slow. Inefficient memory management in for loops is slow. Feel free to preallocate your output vectors and write for loops to your heart's content. If you really want speed you can write this in C++ using Rcpp [1]. If your f() is a standard digital filter algorithm this has

Re: [R] Using lapply when there are dependencies

On May 27, 2015, at 4:34 PM, blue honour via R-help wrote: Hi all, Let's say I have a vector: vv-c(1,2,3) And suppose I have a function f(a,b), which is a function of 2 scalar inputs. I would like to evaluate this function separately for each element of the vv vector while the

Re: [R] Using lapply when there are dependencies

Hi -Original Message- From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of blue honour via R-help Sent: Thursday, May 28, 2015 1:34 AM To: r-help@r-project.org Subject: [R] Using lapply when there are dependencies Hi all, Let's say I have a vector: vv-c(1,2,3

Re: [R] Using lapply when there are dependencies

Winsemius dwinsem...@comcast.net wrote: Subject: Re: [R] Using lapply when there are dependencies Cc: r-help@r-project.org Date: Thursday, May 28, 2015, 7:02 AM On May 27, 2015, at 4:34 PM, blue honour via R-help wrote: Hi all, Let's say I have a vector: vv-c(1,2,3

[R] Using lapply when there are dependencies

Hi all, Let's say I have a vector: vv-c(1,2,3) And suppose I have a function f(a,b), which is a function of 2 scalar inputs. I would like to evaluate this function separately for each element of the vv vector while the second input to f( ) will be the previous output from f( ). So, the

[R] Using lapply on term document matrix to calculate word frequency

Given three TermDocumentMatrix, text1, text2 and text3, I'd like to calculate word frequency for each of them into a data frame and rbind all the data frames. Three are sample - I have hundreds in reality so I need to functionalize this. It's easy to calculate word freq for one TDM: apply(x,

Re: [R] using lapply to get function values

On Jan 10, 2014, at 2:04 AM, Long Vo wrote: Hi R users, I need to apply a function on a list of vectors. This is simple when I use functions that returns only one numerical value such as 'mean' or 'variance'. Things get complex when I use functions returning a list of value, such as

[R] using lapply to get function values

Hi R users, I need to apply a function on a list of vectors. This is simple when I use functions that returns only one numerical value such as 'mean' or 'variance'. Things get complex when I use functions returning a list of value, such as 'acf'. In the following example I first create a list of

Re: [R] using lapply with recode

: Simon Kiss sjk...@gmail.com To: arun smartpink...@yahoo.com Cc: Sent: Friday, November 9, 2012 9:39 AM Subject: Re: [R] using lapply with recode Hi there: None of these suggestions do the work. I tried Jim's suggestion and it returns the following: $df1     a prov 1  1  QUE 2  2  QUE

Re: [R] using lapply with recode

. - Original Message - From: Simon Kiss sjk...@gmail.com To: arun smartpink...@yahoo.com Cc: Sent: Friday, November 9, 2012 9:39 AM Subject: Re: [R] using lapply with recode Hi there: None of these suggestions do the work. I tried Jim's suggestion and it returns the following: $df1

[R] using lapply with recode

Hello: Forgive me, this is surely a simple question but I can't figure it out, having consulted the help archives and Data Manipulation With R (Spector). I have a list of 11 data frames with one common variable in each (prov). I'd like to use lapply to go through and recode one particular level

Re: [R] using lapply with recode

you need to return 'x' as the last statement of the lapply. Sent from my iPad On Nov 8, 2012, at 22:06, Simon Kiss sjk...@gmail.com wrote: Hello: Forgive me, this is surely a simple question but I can't figure it out, having consulted the help archives and Data Manipulation With R

Re: [R] using lapply with recode

   4 Quebec #5   5 Quebec #6   6 AB #7   7 AB #8   8 AB #9   9 AB #10 10 AB A.K. - Original Message - From: Simon Kiss sjk...@gmail.com To: r-help@r-project.org Cc: Sent: Thursday, November 8, 2012 10:06 PM Subject: [R] using lapply with recode Hello: Forgive me

Re: [R] using lapply with recode

-help@r-project.org Cc: Sent: Thursday, November 8, 2012 10:06 PM Subject: [R] using lapply with recode Hello: Forgive me, this is surely a simple question but I can't figure it out, having consulted the help archives and Data Manipulation With R (Spector). I have a list of 11 data frames with one

Re: [R] using lapply

On 10.03.2011 03:46, Kushan Thakkar wrote: I have a function with the follow signare: apply.strategy(instr, strat) where instr and strat are both objects of classes instrument and strategy respectively. I want to apply this function to a list that holds objects of the class instrument.

Re: [R] using lapply

On 10.03.2011 08:30, Arun Kumar Saha wrote: On reply to the post http://r.789695.n4.nabble.com/using-lapply-td3345268.html Hmmm, can you please reply to the original post and quote it? You mail was not recognized to be in the same thread as the message of the original poster (and hence I

Re: [R] using lapply

: Thursday, March 10, 2011 4:38 AM To: Arun Kumar Saha Cc: r-help@r-project.org Subject: Re: [R] using lapply On 10.03.2011 08:30, Arun Kumar Saha wrote: On reply to the post http://r.789695.n4.nabble.com/using-lapply-td3345268.html Hmmm, can you please reply to the original post and quote

Re: [R] using lapply

Sent: Thursday, March 10, 2011 4:38 AM To: Arun Kumar Saha Cc: r-help@r-project.org Subject: Re: [R] using lapply On 10.03.2011 08:30, Arun Kumar Saha wrote: On reply to the post http://r.789695.n4.nabble.com/using-lapply-td3345268.html Hmmm, can you please reply to the original

Re: [R] using lapply

...@syngenta.com Sent: Thursday, March 10, 2011 8:47 AM To: lig...@statistik.tu-dortmund.de; arun.kumar.s...@gmail.com Cc: r-help@r-project.org Subject: Re: [R] using lapply But no one answered Kushan's question about performance implications of for-loop vs lapply. With apologies to George Orwell: for-loops

[R] using lapply

I have a function with the follow signare: apply.strategy(instr, strat) where instr and strat are both objects of classes instrument and strategy respectively. I want to apply this function to a list that holds objects of the class instrument. Currently I am doing this by explicit looping:

[R] using lapply

On reply to the post http://r.789695.n4.nabble.com/using-lapply-td3345268.html Dear Kushan, this may be a good start: ## assuming 'instr.list' is your list object and you are applying my.strat() function on each element of that list, you can use lapply function as lapply(instr.list, function(x)

Re: [R] using lapply and split to plot up subsets of a vector

Hi again, I have spent the last couple of days trying to build a function that will allow me to add to the multiple plots that I created with your advice. I have changed to plot(ln.o2con~lnbm,data=df) in my function and this works fine. On an individual plot I can fit quantile regressions

[R] using lapply and split to plot up subsets of a vector

Hi, I would like to be able to plot data from each of the sp.id on individual plots. At the moment I can plot all the data on one graph with the following commands but I cannot figure out how to get individual graph for each sp.id. i- function(df)plot(lnbm,ln.o2con,data=df) j-

Re: [R] using lapply and split to plot up subsets of a vector

The data= argument to plot only makes sense if the first argument is a formula. So if you change the plot command in your function to plot(ln.o2con~lnbm,data=df) you might get what you want. But I would suggest you take a look at the plot produced by library(lattice)

[R] Using lapply with two lists

Hello guys, I have a list L1 of matrix. I have another list L2 with the same number of elements representing the row of the L matrix that I want to delete (L1[[i]][-L2[[i]],]) but I can't do this with lapply as it iterates through L1 (first argument) and not L2. Any idea? - Anna Lippel --

Re: [R] Using lapply with two lists

-5672 -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of anna Sent: Friday, March 26, 2010 5:35 PM To: r-help@r-project.org Subject: [R] Using lapply with two lists Hello guys, I have a list L1 of matrix. I have another list L2

Re: [R] Using lapply with two lists

Hi Anna, Here is a suggestion: # creating L1 L1 - lapply(1:5, function(x) matrix(rnorm(10), ncol = 2)) L1 # creating L2 L2 - lapply(1:5, function(x) sample(5, 2)) L2 # defining a function foo - function(x, y) list(x[-y,]) # result mapply(foo, L1, L2) HTH, Jorge On Fri, Mar 26, 2010 at 5:34

Re: [R] Using lapply with two lists

Yes thank you Jorge :working: - Anna Lippel -- View this message in context: http://n4.nabble.com/Using-lapply-with-two-lists-tp1692883p1692898.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list

[R] Using lapply and list names not available

Hello All Using lapply and ending up with lists of lists I often end up in the position of not having the names of the list passed by lapply. So, if I am doing something like a plot, and I would like the title to reflect which plot it is, I cannot easily do it. So I find myself doing some

Re: [R] Using lapply and list names not available

The problem is your data is in wide format and you want it in long format. See ?reshape and also see the reshape package. In your example, ?stack is sufficient: library(lattice) xyplot(values ~ seq_along(values) | ind, data = stack(people)) On Feb 5, 2008 11:05 AM, john seers (IFR) [EMAIL

Re: [R] Using lapply and list names not available

/337015 Web: http://med.kuleuven.be/biostat/ http://www.student.kuleuven.be/~m0390867/dimitris.htm - Original Message - From: john seers (IFR) [EMAIL PROTECTED] To: R Help [EMAIL PROTECTED] Sent: Tuesday, February 05, 2008 5:05 PM Subject: [R] Using lapply and list names not available

Re: [R] Using lapply and list names not available

to plot the data (or whatever) and be able to slap a label on it so I can keep track of what I am doing. Regards John Seers -Original Message- From: Gabor Grothendieck [mailto:[EMAIL PROTECTED] Sent: 05 February 2008 16:17 To: john seers (IFR) Cc: R Help Subject: Re: [R] Using lapply

Re: [R] Using lapply and list names not available

track of what I am doing. Regards John Seers -Original Message- From: Gabor Grothendieck [mailto:[EMAIL PROTECTED] Sent: 05 February 2008 16:17 To: john seers (IFR) Cc: R Help Subject: Re: [R] Using lapply and list names not available The problem is your data is in wide

Re: [R] Using lapply and list names not available

OK, that looks a good suggestion. Though it is a bit of a step towards loops and counting ... Thanks a lot. Regards JS -Original Message- From: Gabor Grothendieck [mailto:[EMAIL PROTECTED] Sent: Tue 2/5/2008 4:51 PM To: john seers (IFR) Cc: R Help Subject: Re: [R] Using lapply

Re: [R] using lapply()

- Original Message - From: dxc13 [EMAIL PROTECTED] To: r-help@r-project.org Sent: Tuesday, January 08, 2008 6:11 PM Subject: [R] using lapply() useR's, I am trying to find a quick way to change some values in a list that are subject to a condition to be NA. Consider the 3x1 matrix

[R] using lapply()

useR's, I am trying to find a quick way to change some values in a list that are subject to a condition to be NA. Consider the 3x1 matrix: delta - matrix(c(2.5,2.5,1), nrow = 1) And consider the list named v that has 3 elements v v[[1]] [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8]

Re: [R] using lapply()

: http://med.kuleuven.be/biostat/ http://www.student.kuleuven.be/~m0390867/dimitris.htm - Original Message - From: dxc13 [EMAIL PROTECTED] To: r-help@r-project.org Sent: Tuesday, January 08, 2008 6:11 PM Subject: [R] using lapply() useR's, I am trying to find a quick