[Octave-bug-tracker] [bug #58944] [z, r, p]=qr(a, b) unexpectedly returns z as q instead of q' * b

[Rik]

Follow-up Comment #11, bug #58944 (project octave):

@Markus: Sorry, I think I misled you.  The 3-output argument syntax is valid
for dense matrices as long as there is just a single matrix A.  This is what
polyfit.m is relying on and, as I said, it is valid.  The extra argument '0'
in 


[q,r,p] = qr (a, 0);


is not a matrix B, but a flag asking for an "economy"-sized return value.

So, I think the input validation needs to look like


if (have_b && nargout > 2)
  error (...)



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