[R] when deleting a row from a matrix gives a vector
Marc Schwartz
marc_schwartz at comcast.net
Fri Nov 2 20:52:42 CET 2007
On Fri, 2007-11-02 at 20:47 +0100, Gabriel Valiente wrote:
> Deleting a row from a matrix turns it into a vector (and dim names
> are lost) if the resulting matrix has only one row or column. For
> instance:
>
> > x <- matrix(1:10, ncol=2)
> > x <- x[1,]
>
> turns x into
>
> [1] 1 6
>
> instead of
>
> [,1] [,2]
> [1,] 1 6
>
> Is there any way to force the result to remain a matrix, even if it
> has only one row or column, or even only one entry? Thanks,
>
> Gabriel
See R FAQ 7.5 Why do my matrices lose dimensions?
http://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-do-my-matrices-lose-dimensions_003f
HTH,
Marc Schwartz
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