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

[Rik]

Follow-up Comment #2, bug #53258 (project octave):

Confirmed.

I bet this is because we don't fix a random seed and pcg is an iterative
method which depends on the initial starting point.

For testing I used


N = 1e3;

bm = zeros (N,1);
for i = 1:N
  bm(i) = test ("pcg", "verbose", "pcg.res");
endfor

sum (bm)


The number of tests that pass is >=996, but there are a few failures for each
1000 iterations.

This probably means the BIST tests for all iterative solvers should be checked
to see if they fail occasionally.


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