I am not sure can do this directly in matrix commands. However, Nick Cox's
-matselrc- will do the heavy lifting for you. Use -findit matselrc- to
locate and download.
(note: -findit matrix extraction- would have pointed to this)
For example:
clear
matrix A = matuniform(10,10)
matselrc A B , r(1/3) c(1/3, 5/7)
matrix list B
Scott
> -----Original Message-----
> From: [email protected] [mailto:owner-
> [email protected]] On Behalf Of Tom Boonen
> Sent: Sunday, September 10, 2006 7:23 PM
> To: [email protected]
> Subject: st: extract selection of columns from matrix
>
> Hello,
>
> I have a matrix:
>
> matrix define A = (1,2,3,4,10,11,12,13 \ 5,6,7,8, 1,2,3,4)
> matrix list A
>
> Now I want to extract a matrix B which should contain rows 1..3; and
> then the first, third, fifth and all columns higher than five of
> matrix A.
>
> I tried:
>
> matrix B = A[1..3,1.3.5...]
>
> But it doesn't work. How can I extract a selection of colums? The
> reference manual does not contain an example on this problem. Thanks
> for your help!
>
*
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