[Bug 2098115] Re: octave-control: autopkgtest fails vs lapack 3.12.1-2 on ppc64el

[Launchpad Bug Tracker]

This bug was fixed in the package octave-control - 4.1.0-2ubuntu2

---------------
octave-control (4.1.0-2ubuntu2) plucky; urgency=medium

  * d/p/test-tolerance.patch: increase the tolerance even more

octave-control (4.1.0-2ubuntu1) plucky; urgency=medium

  * d/p/test-tolerance.patch: increase tolerance further (LP: #2098115)
    This test still fails on ppc64el because of the tolerance being too
    strict.

 -- Nick Rosbrook <enr0n at ubuntu.com>  Wed, 12 Feb 2025 13:14:40 -0500

** Changed in: octave-control (Ubuntu)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/2098115

Title:
  octave-control: autopkgtest fails vs lapack 3.12.1-2 on ppc64el

Status in lapack package in Ubuntu:
  New
Status in octave-control package in Ubuntu:
  Fix Released

Bug description:
  Here is the relevant part of the failure[1]:

   >>>>> /tmp/autopkgtest.eNmmQF/build.XH4/src/inst/impulse.m
  178s ***** test
  178s  t=0:1:4;
  178s  sys=tf(1,[1 2 2 1]);
  178s  y=impulse(sys,t);
  178s  assert (y(1), 0, eps);
  178s  assert (y(2), 0.241686482894434, 2*eps);
  178s  assert (y(3), 0.404040547757057, 2*eps);
  178s  assert (y(4), 0.307384479794317, 2*eps);
  178s  assert (y(5), 0.121908527560869, 6*eps);  # error propagation
  178s ***** test
  178s  t=0:1:4;
  178s  sys=tf(1,[1 2 2 1]);
  178s  sys2=c2d(sys, 1, "impulse");
  178s  y=impulse(sys2,t);
  178s  assert (y(1), 0, eps);
  178s  assert (y(2), 0.241686482894434, 2*eps);
  178s  assert (y(3), 0.404040547757057, 3*eps);
  178s  assert (y(4), 0.307384479794317, 7*eps);
  178s  assert (y(5), 0.121908527560869, 7*eps);  # error propagation
  178s !!!!! test failed
  178s ASSERT errors for:  assert (y (3),0.404040547757057,3 * eps)
  178s 
  178s   Location  |  Observed  |  Expected  |  Reason
  178s      ()        0.40404      0.40404      Abs err 7.2164e-16 exceeds tol 6.6613e-16 by 6e-17

  This is the same as https://bugs.debian.org/cgi-
  bin/bugreport.cgi?bug=1091162, but on ppc64el.

  We should simply increase the tolerance further.

  [1] https://autopkgtest.ubuntu.com/results/autopkgtest-
  plucky/plucky/ppc64el/o/octave-control/20250212_042248_13d24@/log.gz

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