[Octave-bug-tracker] [bug #53258] test pcg.m fail

[Carlo de Falco]

Follow-up Comment #16, bug #53258 (project octave):

I went back to pcg in the default branch to hgid 2d68dc548561 (just before
your change) and ran again


for i = 1: 10_000; test pcg; endfor


and got failure 57 times, this means approximately 1/175 
of the runs are failing.

Tried again with Cristiano's version and got 0 failures.

My guess is that there might be a bug in the pcg implementation
in the default branch that hinders convergence rate and your changes to the
tests are just hiding it.

My suggestion is to either revert this change and let the tests fail to make
the bug apparent or to just move over to Cristiano's implementation that seems
to have fixed this issue.

Does that make sense?

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