[R] Matrix manipulation

Tim Calkins
Mon, 22 Oct 2007 22:27:03 -0000

use the '-' feature.

>mat <- matrix(rnorm(100), nrow = 10)

#snip the second row
>mat[-2,]

#snip the third column
>mat[,-3]

#snip rows 5 and 7
>mat[-c(5,7),]

cheers
tc

On 10/23/07, yiferic at berkeley.edu <yiferic at berkeley.edu>
wrote:
> Hi everyone,
>
> suppose I have a 2D matrix, is there a command to snip out a specific
> row/column and then remerge the remaining columns/rows back into a
> contiguous matrix? I will need to repeat this operation quite a
> bit(reverse selection).
>
> Thanks for any insights you can offer.
>
> Yifei
>
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--
Tim Calkins
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