[Octave-bug-tracker] [bug #55421] Test for qr.cc randomly fails

[Markus Mützel]

URL:
  <https://savannah.gnu.org/bugs/?55421>

                 Summary: Test for qr.cc randomly fails
                 Project: GNU Octave
            Submitted by: mmuetzel
            Submitted on: Tue 08 Jan 2019 01:38:56 PM UTC
                Category: Test Suite
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Unexpected Error
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 5.0.1
        Operating System: Any

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Details:

The BIST for qr.cc randomly fails. E.g. for a recent buildbot run:

>>>>> processing
/scratch/buildbot/workers/jwe-debian-x86_64-0/stable-clang-4_0-debian/build/libinterp/dldfcn/qr.cc-tst
***** testif HAVE_CXSPARSE
 n = 20;  d = 0.2;
 a = sprandn (n,n,d) + speye (n,n);
 b = randn (n,2);
 [c,r] = qr (a, b);
 assert (r\c, full (a)\b, 10e-10);
!!!!! test failed
ASSERT errors for:  assert (r \ c,full (a) \ b,10e-10)
  Location  |  Observed  |  Expected  |  Reason
   (6,2)      3031.3529    3031.3529     Abs err 1.0123e-09 exceeds tol 1e-09
by 1e-11


Maybe the tolerance should be extended or we should pick a seed for the random
number generator.




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