Re: [R] Converting a list to a matrix - I still don't think I have it right
Mick,
Does this do it?
mymat - do.call('rbind',l2)
rownames(mymat) - names(l2)
Sean
On Feb 17, 2005, at 9:36 AM, michael watson ((IAH-C)) wrote:
Hi
We have touched on this before, but I don't think I quite got it right.
So I have a list, each element of which is a a vector of 2 numbers:
l2
$cat000_a01
[1] 0.3429944 4.5138244
$cat000_a02
[1] 0.1929336 4.3064944
$cat000_a03
[1] -0.2607796 4.1551591
What I actually want to convert this into is a matrix with the names
(cat000_a01 etc) as row names, the first element of each of the vectors
forming the first column of the new matrix, and the second element of
each of the vectors forming the second column:
cat000_a01 0.3429944 4.5138244
cat000_a02 0.1929336 4.3064944
cat000_a03 -0.2607796 4.1551591
What was suggested on the list last time was
matrix(unlist(mylist),nrow=length(mylist)). But if I do this I get:
matrix(unlist(l2),nrow=length(l2))
[,1] [,2]
[1,] 0.3429944 4.3064944
[2,] 4.5138244 -0.2607796
[3,] 0.1929336 4.1551591
Which is not what I want. Here, the second element of the first vector
in my list has gone into the first column of the new matrix, and that's
not what I want at all.
Any more help would be appreciated.
Thanks
Mick
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Re: [R] Converting a list to a matrix - I still don't think I have it right
Does do.call(rbind, l2) do what you want? -roger michael watson (IAH-C) wrote: Hi We have touched on this before, but I don't think I quite got it right. So I have a list, each element of which is a a vector of 2 numbers: l2 $cat000_a01 [1] 0.3429944 4.5138244 $cat000_a02 [1] 0.1929336 4.3064944 $cat000_a03 [1] -0.2607796 4.1551591 What I actually want to convert this into is a matrix with the names (cat000_a01 etc) as row names, the first element of each of the vectors forming the first column of the new matrix, and the second element of each of the vectors forming the second column: cat000_a01 0.3429944 4.5138244 cat000_a02 0.1929336 4.3064944 cat000_a03 -0.2607796 4.1551591 What was suggested on the list last time was matrix(unlist(mylist),nrow=length(mylist)). But if I do this I get: matrix(unlist(l2),nrow=length(l2)) [,1] [,2] [1,] 0.3429944 4.3064944 [2,] 4.5138244 -0.2607796 [3,] 0.1929336 4.1551591 Which is not what I want. Here, the second element of the first vector in my list has gone into the first column of the new matrix, and that's not what I want at all. Any more help would be appreciated. Thanks Mick __ 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 -- Roger D. Peng http://www.biostat.jhsph.edu/~rpeng/ __ 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] Converting a list to a matrix - I still don't think I have it right
Hi Michael On 17 Feb 2005 at 14:36, michael watson (IAH-C) wrote: Hi We have touched on this before, but I don't think I quite got it right. So I have a list, each element of which is a a vector of 2 numbers: l2 $cat000_a01 [1] 0.3429944 4.5138244 $cat000_a02 [1] 0.1929336 4.3064944 $cat000_a03 [1] -0.2607796 4.1551591 What I actually want to convert this into is a matrix with the names (cat000_a01 etc) as row names, the first element of each of the vectors forming the first column of the new matrix, and the second element of each of the vectors forming the second column: cat000_a010.3429944 4.5138244 cat000_a020.1929336 4.3064944 cat000_a03-0.2607796 4.1551591 What was suggested on the list last time was matrix(unlist(mylist),nrow=length(mylist)). But if I do this I get: matrix(unlist(l2),nrow=length(l2)) [,1] [,2] [1,] 0.3429944 4.3064944 [2,] 4.5138244 -0.2607796 [3,] 0.1929336 4.1551591 Try byrow =TRUE argument x-list(a=c(1,2), b=c(4,5), d= c(10,12)) matrix(unlist(x),nrow=length(x), byrow=T) [,1] [,2] [1,]12 [2,]45 [3,] 10 12 Cheers Petr Which is not what I want. Here, the second element of the first vector in my list has gone into the first column of the new matrix, and that's not what I want at all. Any more help would be appreciated. Thanks Mick __ 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 Petr Pikal [EMAIL PROTECTED] __ 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] Converting a list to a matrix - I still don't think I have it right
michael watson (IAH-C) [EMAIL PROTECTED] writes: Hi We have touched on this before, but I don't think I quite got it right. So I have a list, each element of which is a a vector of 2 numbers: l2 $cat000_a01 [1] 0.3429944 4.5138244 $cat000_a02 [1] 0.1929336 4.3064944 $cat000_a03 [1] -0.2607796 4.1551591 What I actually want to convert this into is a matrix with the names (cat000_a01 etc) as row names, the first element of each of the vectors forming the first column of the new matrix, and the second element of each of the vectors forming the second column: cat000_a010.3429944 4.5138244 cat000_a020.1929336 4.3064944 cat000_a03-0.2607796 4.1551591 do.call(rbind, list) -- O__ Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 __ 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
