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[Octave-bug-tracker] [bug #32901] "diag" returns empty matrix where matl

From: Marco Caliari
Subject: [Octave-bug-tracker] [bug #32901] "diag" returns empty matrix where matlab's diag returns [0]
Date: Tue, 29 Mar 2011 10:06:42 +0000
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-GB; rv: Gecko/20101203 Firefox/3.6.13

Follow-up Comment #5, bug #32901 (project octave):

Before any modification, I think we should consider whether


should coincide with v for any column vector v (or with v.' for any row vector
v) and any integer k. This is actually true for length(v)>=1. It is not true
for v=zeros(1,0) (or v=zeros(0,1)) and k=1 in Matlab and never true in Octave.
Later, the behaviour of spdiags should be the same of diag when creating
matrices. This is actually not always true, both in Matlab and Octave, with
the bad guys zeros(1,0) and zeros(0,1). 



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