[Octave-bug-tracker] [bug #32901] "diag" returns empty matrix where matlab's diag returns [0]

[Marco Caliari]

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

Before any modification, I think we should consider whether

diag(diag(v,k),k)


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). 

Marco

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