[R] sorting a matrix by the column

Gabor Grothendieck ggrothendieck at gmail.com
Wed Feb 11 13:36:52 CET 2009


This is what I get:

> temp2 <- matrix(rnorm(10),nc=1,nrow=5)
> rownames(temp2) <- c("a","b","c","d","e","f","g","h","i")
Error in dimnames(x) <- dn :
  length of 'dimnames' [1] not equal to array extent
> R.version.string
[1] "R version 2.8.1 Patched (2008-12-26 r47350)"

On Wed, Feb 11, 2009 at 1:18 AM,  <markleeds at verizon.net> wrote:
> this is a bad question but I can't figure it out and i've tried. if i sort
> the 2 column
> matrix , temp1, by the first column, then things work as expected. But,
> if I sort the 1 column matrix, temp2, then it gets turned coerced to a
> vector. I realize that I
> need to use drop=FALSE but i've put it in a few different places with no
> success. Thanks.
>
> temp1 <- matrix(rnorm(10),nc=2,nrow=5)
> rownames(temp1) <- c("a","b","c","d","e")
> print(temp2)
> temp1 <- temp1[order(temp1[,1]),]
> print(temp1)
>
> temp2 <- matrix(rnorm(10),nc=1,nrow=5)
> rownames(temp2) <- c("a","b","c","d","e","f","g","h","i")
> print(temp2)
> temp2 <- temp2[order(temp2[,1]),]   # PROBLEM IS HERE
> print(temp2)
>
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