bugGNU Octave - Bugs: bug #64607, [octave forge] (interval) two test...


bug #64607: [octave forge] (interval) two test failures about [-inf, inf]

Submitter:  Vincent Lefèvre <vinc17>
Submitted:  Tue 29 Aug 2023 07:48:44 AM UTC
Category:  Octave Package Severity:  3 - Normal
Priority:  5 - Normal Item Group:  None
Status:  None Assigned to:  None
Originator Name:  Open/Closed:  * Open
Release:  * other Operating System:  * Any
Fixed Release:  None Planned Release:  None
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Tue 29 Aug 2023 07:52:18 AM UTC, comment #1: 

Oops, I don't know how to edit the bug title (I forgot to complete it). It should be something like "[octave forge] (interval) 2 test failures about [-inf, inf]".

Vincent Lefèvre <vinc17>
Tue 29 Aug 2023 07:48:44 AM UTC, original submission:  

With the interval 3.2.1 package, https://ci.debian.net/data/autopkgtest/testing/amd64/o/octave-interval/37232402/log.gz shows 2 failures with GNU MPFR 4.2.1:

165s *** assert (intervaltotext (infsup (-inf, inf), "[<g]"), "[-inf, inf]");
165s !!!!! test failed
165s ASSERT errors for:  assert (intervaltotext (infsup (-inf, inf), "[<g]"),"[-inf, inf]")


165s *** assert (intervaltotext (infsup (-inf, inf), "[<F]"), "[-INF, INF]");
165s !!!!! test failed
165s ASSERT errors for:  assert (intervaltotext (infsup (-inf, inf), "[<F]"),"[-INF, INF]")

This is due to a fix of a bug in the MPFR formatted functions: the "+" flag was ignored for Inf and NaN, and it is now honored like in the C formatted functions (the MPFR documentation was contradictory on this point). Octave-interval seems to use this flag in this case:

src/intervaltotext.cc contains

      case INF_SUP:
          force_sign = (layout.display_plus == ALWAYS ||
              (layout.display_plus == INNER_ZERO && inf < 0.0 && 0.0 < sup));
          l = double_to_string (layout, stat, force_sign, inf, MPFR_RNDD);
          u = double_to_string (layout, stat, force_sign, sup, MPFR_RNDU);

(INNER_ZERO is the default, and inf < 0.0 && 0.0 < sup is true, and double_to_string eventually calls mpfr_sprintf).

BTW, https://octave.sourceforge.io/interval/function/intervaltotext.html says

    Output Entire as [-Inf, +Inf] instead of [Entire]

with a sign for both Inf. So, with the MPFR fix, Octave-interval will behave as expected. It is just the test that is now wrong. The expected string should be "[-inf, +inf]" and "[-INF, +INF]" respectively.

Vincent Lefèvre <vinc17>


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    Follow 2 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2023-08-29 mmuetzel Carbon-CopyRemoved 102357 -
    2023-08-29 mmuetzel Summary[octave forge] (interval) [octave forge] (interval) two test failures about [-inf, inf]

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