Matrices are not made of paper! :) If you index a matrix with negative
numbers, you'll get back that matrix minus that column or row.
A quick example:
>a<-matrix(c(1:9),ncol=3) # Create a sample matrix
>a # Display it
[,1] [,2] [,3]
[1,] 1 4 7
[2,] 2 5 8
[3,] 3 6 9
>a[,2] # Get the second column
[1] 4 5 6
>a[,-2] # Everything except the second column
[,1] [,2]
[1,] 1 7
[2,] 2 8
[3,] 3 9
Julian
[EMAIL PROTECTED] 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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