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Index of max, sort etc

From: Dirk Laurie
Subject: Index of max, sort etc
Date: Wed, 29 Mar 2000 09:08:52 +0200 (SAST)

I often need to do something like this:

Find the row of matrix A for which some criterion
(e.g. its inner product with a vector w) is a maximum.

I use the following code:

   [actual_unnneeded_max, kmax] = max(A*w);
   desired_row = A(kmax,:);

It would have been nice if there existed a function
say "imax" which behaved exactly like "max" except that
the order of the return arguments is different. So
that one could code:

   desired_row = A(imax(A*w),:);

Similar considerations apply to "sort".

I know I can easily define such a function myself ...
but if something of the kind exists or could exist,
why must I?


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