[R] Fastest way to merge matrix columns into a comma delimited string?

[Peter Langfelder]

apply(test, 1, paste, collapse = ",")


On Tue, Jun 15, 2010 at 11:27 AM, Jonathan Greenberg
<greenberg at ucdavis.edu> wrote:
> Folks:
>
> Say I have a matrix:
>
> test=matrix(c(1,2,3),nrow=10,ncol=3)
>
> I would like to have an output character vector where each line is
> row's values delimited by commas, e.g.:
>
> "1,2,3"
> "2,3,1"
> "3,1,2"
> ...
> "1,2,3"
>
> What is the fastest way of doing this?  I can paste() row-by-row but
> this seems an inefficient approach to doing this.  Thanks!  I'm not
> asking how to write a CSV file, mind you, I want the array as an R
> data.frame or vector.
>
> --j
>
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