[R] Converting a list to a matrix - I still don't think I have it right
Roger D. Peng
rpeng at jhsph.edu
Thu Feb 17 16:23:41 CET 2005
do what you want?
michael watson (IAH-C) wrote:
> 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:
>  0.3429944 4.5138244
>  0.1929336 4.3064944
>  -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:
> [,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.
> R-help at stat.math.ethz.ch mailing list
> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Roger D. Peng
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