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From: <HIDDEN>
Newsgroups: comp.soft-sys.matlab
Subject: Re: problem about graphshortestpath()
Date: Wed, 18 Mar 2009 21:55:03 +0000 (UTC)
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"Roger Stafford" <ellieandrogerxyzzy@mindspring.com.invalid> wrote in message <gprp12\$1ta\$1@fred.mathworks.com>...
>   The function 'graphshortestpath' expects a square matrix, and you have given it only the upper half, so you will have to fill in or at least extend to a full 5 x 5 matrix before making the call.
>
> Roger Stafford

To enlarge upon what I said above, when you create a sparse matrix, it is possible to force a square size on it even though the area it is defined in is not square.  For example

A = sparse([1 2 1],[1 2 3],1);

will have size(A) = [2,3], whereas

B = sparse([1 2 1],[1 2 3],1,3,3);

gives size(B) = [3,3], even though the non-zero portions of A and B are identical.

Roger Stafford
```