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Subject: Re: matrix multiplication with zero dimensions
Date: Mon, 7 Jan 2013 07:38:09 +0000 (UTC)
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"Roger Stafford" wrote in message <kcdmmk$ekv$1@newscl01ah.mathworks.com>...
> "Matt J" wrote in message <kcdl09$975$1@newscl01ah.mathworks.com>...
> > But... I still think these things should be documented somewhere. They don't satisfy the basic definitions of matrix multiplication, PROD, or SUM. They're just extrapolations of them.
> - - - - - - -
>   I agree with you there.  It should have been explicitly documented somewhere.
> 
> Roger Stafford

Quoting from the doc for mtimes:

"Note    If A is an m-by-0 empty matrix and B is a 0-by-n empty matrix, where m and n are positive integers, A*B is an m-by-n matrix of all zeros."

James Tursa