[bug #68238] linsolve: 2nd output should return rcond for square matrix, rank for nonsquare

Markus Mützel <[email protected]> Mon, 20 Apr 2026 05:52:34 -0400 (EDT)

Newsgroups	gmane.comp.gnu.octave.bugs
Message-ID	<[email protected]>

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Follow-up Comment #6, bug #68238 (group octave):

The new test fails on the macOS runners on GitHub.
E.g.:
https://github.com/gnu-octave/octave/actions/runs/24579834712/job/71874517522#step:14:1522

>>>>> processing
>>>>> /Users/runner/work/octave/octave/scripts/linear-algebra/linsolve.m
***** test <*68238>
 A = hilb (4);
 b = [1:4]';
 [x, R] = linsolve (A, b);
 assert (x, [-64; 900; -2520; 1820], -3e-13);
 assert (R, rcond (A));
!!!!! regression: https://octave.org/testfailure/?68238
ASSERT errors for:  assert (x,([-64; 900; -2520; 1820]),-3e-13)

  Location  |  Observed  |  Expected  |  Reason
    (1)          -64          -64        Rel err 3.5882e-13 exceeds tol 3e-13
by 6e-14


Is that an actual issue? Or can the tolerance be relaxed in this test (e.g.,
from -3e-13 to -4e-13)?



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