[R] Data frame transpose
Hi All, I want to ask if there is a transpose function for data frame like the procedure of transpose in SAS? Because I want to partially transpose a data frame which contains 5 columns (siteid, date, time, obs, mod), what I want to do is to put time as the column variables along with siteid, and date, and put obs and mod in the row names. specifically to transpose a data frame: siteid datetime obs mod A 7/801 2 5 A 7/80238 A 7/80358 A 7/9 01 3 6 A 7/9 025 8 A 7/9 03 6 7 .. B 7/8 01 4 7 B7/8 02719 B 7/8 03 49 .. To siteiddatename 0102 03 A 7/8 obs 2 35 A 7/8 mod 5 88 A 7/9 obs 3 5 6 A 7/9 mod 6 87 ... B 7/8obs 4 74 B 7/8mod 7 19 9 Thank you very much! Dave __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
Re: [R] Data frame transpose
On Mon, 29 Sep 2003 [EMAIL PROTECTED] wrote: Hi All, I want to ask if there is a transpose function for data frame like the procedure of transpose in SAS? Because I want to partially transpose a data frame which contains 5 columns (siteid, date, time, obs, mod), what I want to do is to put time as the column variables along with siteid, and date, and put obs and mod in the row names. specifically to I think reshape() does what you want -thomas transpose a data frame: siteid datetime obs mod A 7/801 2 5 A 7/80238 A 7/80358 A 7/9 01 3 6 A 7/9 025 8 A 7/9 03 6 7 .. B 7/8 01 4 7 B7/8 02719 B 7/8 03 49 .. To siteiddatename 0102 03 A 7/8 obs 2 35 A 7/8 mod 5 88 A 7/9 obs 3 5 6 A 7/9 mod 6 87 ... B 7/8obs 4 74 B 7/8mod 7 19 9 Thank you very much! Dave __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help Thomas Lumley Assoc. Professor, Biostatistics [EMAIL PROTECTED] University of Washington, Seattle __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
Re: [R] Data frame transpose
Dave - I'm not sure whether there is already a function which does exactly what you want, because this is kind of a special case. The functions I wold look at are: by, aggregate, tapply, mapply, and, in the package nlme one I didn't know about before called gapply. But, in your case, the part that makes it doable is that all of the columns in that part of the dataframe which you want to transpose are numeric. (At least, it looks that way from your email.) And you have the same number of time points in every site x date. So you could extract just the three columns time, obs, mod as a numeric matrix, cast it to an array, use aperm(), then cast it back to a matrix and then back to a dataframe. The basic tools for this are: data.matrix, array, aperm, matrix and data.frame. I've got to let you work out the details yourself. The key when planning this is to remember that multi-dimensional arrays in R use Fortran storage order: the first index varies fastest. Some one else may be able to come up with a much more direct solution. HTH - tom blackwell - u michigan medical school - ann arbor - On Mon, 29 Sep 2003 [EMAIL PROTECTED] wrote: I want to ask if there is a transpose function for data frame like the procedure of transpose in SAS? Because I want to partially transpose a data frame which contains 5 columns (siteid, date, time, obs, mod), what I want to do is to put time as the column variables along with siteid, and date, and put obs and mod in the row names. specifically to transpose a data frame: siteid datetime obs mod A 7/801 2 5 A 7/80238 A 7/80358 A 7/9 01 3 6 A 7/9 025 8 A 7/9 03 6 7 .. B 7/8 01 4 7 B7/8 02719 B 7/8 03 49 .. To siteiddatename 0102 03 A 7/8 obs 2 35 A 7/8 mod 5 88 A 7/9 obs 3 5 6 A 7/9 mod 6 87 ... B 7/8obs 4 74 B 7/8mod 7 19 9 Thank you very much! Dave __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
RE: [R] Data frame transpose
Assuming that the data frame is called m, you can - split the data frame by the
values of siteid and date- apply a function to create the new data frame for each such
group and - use rbind to put it back together like this: fn lt;- function(x) { y
lt;- t(x[,4:5]) data.frame( siteid=x[1,1], date=x[1,2], name=colnames(x)[4:5],
x01=y[,1], x02=y[,2], x03=y[,3] )}m lt;- do.call( rbind,
lapply(split(m,list(m$siteid,m$date)),fn) )If the order matters then add this line: m
lt;- m[ order(m$siteid,m$date), ]--- On Mon 09/29, lt; [EMAIL PROTECTED] gt;
wrote:From: [mailto: [EMAIL PROTECTED]: [EMAIL PROTECTED]: Mon, 29 Sep 2003 13:15:36
-0400Subject: [R] Data frame transposeHi All,I want to ask if there is a transpose
function for data frame like theprocedure of transpose in SAS? Because I want to
partially transpose adata frame which contains 5 columns (siteid, date, time, obs,
mod), whatI want to do is to put time as the column variables along with siteid,and
date, and put obs and mod in the row names. specifically totranspose a data
frame:siteid date time obs modA 7/8 01 2 5A 7/8 02 3 8A 7/8 03 5 8A 7/9 01 3 6A 7/9 02
5 8A 7/9 03 6 7..B 7/8 01 4 7B 7/8 02 7 19B 7/8 03 4 9..Tositeid date name 01
02 03 A 7/8 obs 2 3 5A 7/8 mod 5 8 8A 7/9 obs 3 5 6A 7/9 mod 6 8 7...B 7/8 obs
4 7 4B 7/8 mod 7 19 9Thank you very [EMAIL PROTECTED] mailing
listhttps://www.stat.math.ethz.ch/mailman/listinfo/r-help
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RE: [R] Data frame transpose
Sorry about the formatting in that previous email. Here it is
again, hopefully with the correct formatting this time.
Assuming that the data frame is called m, you can
- split the data frame by the values of siteid and date
- apply a function to create the new data frame for each such group and
- use rbind to put it back together like this:
fn - function(x) {
y - t(x[,4:5])
data.frame( siteid=x[1,1], date=x[1,2], name=colnames(x)[4:5], x01=y[,1], x02=y[,2],
x03=y[,3] )
}
m - do.call( rbind, lapply(split(m,list(m$siteid,m$date)),fn) )
If order matters, add this:
m - m[order(m$siteid,m$date),]
--- On Mon 09/29, [EMAIL PROTECTED] wrote:
From: [mailto: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Date: Mon, 29 Sep 2003 13:15:36 -0400
Subject: [R] Data frame transpose
brbrbrbrHi All,brbrI want to ask if there is a transpose function for data
frame like thebrprocedure of transpose in SAS? Because I want to partially transpose
abrdata frame which contains 5 columns (siteid, date, time, obs, mod), whatbrI
want to do is to put time as the column variables along with siteid,brand date, and
put obs and mod in the row names. specifically tobrtranspose a data
frame:brbrsiteid datetime obs modbrA 7/801
2 5brA 7/80238brA 7/8
0358br A 7/9 01 3 6br A
7/9 025 8br A 7/9 03 6 7br
..br B 7/8 01 4 7brB
7/8 02719br B 7/8 03 49br
..brbrTobrbrsiteiddate!
name 0102 03 brA 7/8 obs 2 3
5brA 7/8 mod 5 88brA 7/9
obs 3 5 6brA 7/9 mod 6 8
7br ...brB 7/8obs 4 7
4brB 7/8mod 7 19 9br
brbrbrThank you very
much!brbrDavebrbr__br[EMAIL
PROTECTED] mailing listbrhttps://www.stat.math.ethz.ch/mailman/listinfo/r-helpbr
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