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Re: How doyou vectorize pulling values out of a matrix?


From: Tom Holroyd
Subject: Re: How doyou vectorize pulling values out of a matrix?
Date: Mon, 24 Jul 2006 20:24:19 -0400 (EDT)

Assume there is mymatrix [500,500] and I wish to retrieve
100 certain values from there.

Well, if a is 500,500, then a(:) is 250000 elements.

The specific indices are stored in two vectors Xindex and
Yindex that are each [1,100]

You can say "a(Xindex + Yindex * 500)" (or the other way around, I'm not sure). I hope this doesn't involve much copying.


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