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Topic: Matrix index question
Replies: 1   Last Post: Jul 9, 1996 4:06 AM

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Mark Nathan Broadie

Posts: 2
Registered: 12/11/04
Matrix index question
Posted: Jul 8, 1996 10:47 AM
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Suppose I have a matrix A with r rows and c columns
and I have a vector v of length c, each entry is an
integer from 1 to r. How do I extract the elements

A(v(1):1), A(v(2):2), ..., A(v(c):c)

and put the results into a vector w?

My solution was
A = reshape(A, 1, r*c)
w = A( [ 0 : r : r(c-1) ] + v )

but is there any more obvious or straightforward
way to do this?

-Mark Broadie
mbroadie@research.gsb.columbia.edu





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