RE: [R] how to use do.call(rbind, get(list(mlist)))
Here's one way (should work for data frames, too): mlist - paste(m, 1:5, sep=) for (i in 1:5) assign(mlist[i], matrix(runif(4), 2, 2)) do.call(rbind, mget(mlist, .GlobalEnv)) [,1] [,2] [1,] 0.33846095 0.09494054 [2,] 0.65229451 0.26009002 [3,] 0.53969914 0.66481544 [4,] 0.59316498 0.36125843 [5,] 0.24005411 0.01010594 [6,] 0.06878842 0.93929806 [7,] 0.02618064 0.06243190 [8,] 0.08144251 0.04331587 [9,] 0.95216684 0.61066435 [10,] 0.03712678 0.95809995 get() takes a character vector as the first argument, and you passed it a list with one component (a character vector). Even if you pass mlist to get(), it will only get the first one. Andy From: roger bos I have around 200 data frames I want to rbind in a vectorized way. The object names are: m302 m303 ... m500 So I tried: mlist - paste(m,302:500,sep=) dat - do.call(rbind, get(list(mlist))) and I get Error in get(x, envir, mode, inherits) : invalid first argument I know rbind is valid because dat - rbind(m302, m303, m304, m305) works, I am just too lazy to type it out to m500. I also tried it without the get() portion, but then dat ends up being a column with just the names of the objects, not the objects themselves. Thanks in advance for showing me the errors in my attempts. Roger __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
RE: [R] how to use do.call(rbind, get(list(mlist)))
Roger: Please re-read ?get, where it says that the x argument must be a single character string name, not a list.You must first create the list using get and then call do.call on that list: do.call(rbind,lapply(mlist,get)) -- Bert Gunter Genentech Non-Clinical Statistics South San Francisco, CA The business of the statistician is to catalyze the scientific learning process. - George E. P. Box -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of roger bos Sent: Friday, January 21, 2005 9:07 AM To: r-help@stat.math.ethz.ch Subject: [R] how to use do.call(rbind, get(list(mlist))) I have around 200 data frames I want to rbind in a vectorized way. The object names are: m302 m303 ... m500 So I tried: mlist - paste(m,302:500,sep=) dat - do.call(rbind, get(list(mlist))) and I get Error in get(x, envir, mode, inherits) : invalid first argument I know rbind is valid because dat - rbind(m302, m303, m304, m305) works, I am just too lazy to type it out to m500. I also tried it without the get() portion, but then dat ends up being a column with just the names of the objects, not the objects themselves. Thanks in advance for showing me the errors in my attempts. Roger __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] how to use do.call(rbind, get(list(mlist)))
roger bos wrote: I have around 200 data frames I want to rbind in a vectorized way. The object names are: m302 m303 ... m500 So I tried: mlist - paste(m,302:500,sep=) dat - do.call(rbind, get(list(mlist))) do.call(rbind, lapply(mlist, get)) Uwe Ligges and I get Error in get(x, envir, mode, inherits) : invalid first argument I know rbind is valid because dat - rbind(m302, m303, m304, m305) works, I am just too lazy to type it out to m500. I also tried it without the get() portion, but then dat ends up being a column with just the names of the objects, not the objects themselves. Thanks in advance for showing me the errors in my attempts. Roger __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
RE: [R] how to use do.call(rbind, get(list(mlist)))
get() doesn't take a list. You need to wrap it in an lapply so that it grabs the dataframes individually and then wraps it into a list for do.call(). The easy way, however, that doesn't involve do.call or get is to simply construct the proper text rbind query and then run it with eval. eval(parse(text = paste(rbind(, paste(m, 302:500, sep = , collapse = , ), To use the do.call() / get() construct, I think this is what you were thinking of: mlist - paste(m,302:500,sep=) do.call(rbind, lapply(mlist, get)) Best, Robert -Original Message- From: roger bos [mailto:[EMAIL PROTECTED] Sent: Friday, January 21, 2005 12:07 PM To: r-help@stat.math.ethz.ch Subject: [R] how to use do.call(rbind, get(list(mlist))) I have around 200 data frames I want to rbind in a vectorized way. The object names are: m302 m303 ... m500 So I tried: mlist - paste(m,302:500,sep=) dat - do.call(rbind, get(list(mlist))) and I get Error in get(x, envir, mode, inherits) : invalid first argument I know rbind is valid because dat - rbind(m302, m303, m304, m305) works, I am just too lazy to type it out to m500. I also tried it without the get() portion, but then dat ends up being a column with just the names of the objects, not the objects themselves. Thanks in advance for showing me the errors in my attempts. Roger __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
RE: [R] how to use do.call(rbind, get(list(mlist)))
Roger -- First, if you have the data frames in a list already, you can just use those; no need to bother with the names. If the data frames are all separate, but you have the names, you can first create a list of the data frames themselves: do.call(rbind, lapply(mlist, get)) # assumes they're in the workspace An example: temp1 - matrix(runif(10), 5, 2) temp2 - matrix(-runif(10), 5, 2) (for easy identifiability) temp3 - do.call(rbind, lapply(c(temp1, temp2), get)) temp3 - do.call(rbind, list(temp1, temp2)) (same as above) Hope this helps, Matt Wiener -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of roger bos Sent: Friday, January 21, 2005 12:07 PM To: r-help@stat.math.ethz.ch Subject: [R] how to use do.call(rbind, get(list(mlist))) I have around 200 data frames I want to rbind in a vectorized way. The object names are: m302 m303 ... m500 So I tried: mlist - paste(m,302:500,sep=) dat - do.call(rbind, get(list(mlist))) and I get Error in get(x, envir, mode, inherits) : invalid first argument I know rbind is valid because dat - rbind(m302, m303, m304, m305) works, I am just too lazy to type it out to m500. I also tried it without the get() portion, but then dat ends up being a column with just the names of the objects, not the objects themselves. Thanks in advance for showing me the errors in my attempts. Roger __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] how to use do.call(rbind, get(list(mlist)))
On Fri, 21 Jan 2005, roger bos wrote: I have around 200 data frames I want to rbind in a vectorized way. The object names are: m302 m303 ... m500 So I tried: mlist - paste(m,302:500,sep=) dat - do.call(rbind, get(list(mlist))) and I get Error in get(x, envir, mode, inherits) : invalid first argument Yep. get() takes a single variable name as its argument. If you tried get(list(m302,m303)) you would get the same error. I know rbind is valid because dat - rbind(m302, m303, m304, m305) works, I am just too lazy to type it out to m500. I also tried it without the get() portion, but then dat ends up being a column with just the names of the objects, not the objects themselves. Indeed. This translates to rbind(m302,m303 You could use mget() instead of get(). -thomas __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
