[Octave-patch-tracker] [patch #9453] assert() should report tolerance exceedance

[Dan Sebald]

URL:
  <http://savannah.gnu.org/patch/?9453>

                 Summary: assert() should report tolerance exceedance
                 Project: GNU Octave
            Submitted by: sebald
            Submitted on: Wed 13 Sep 2017 04:29:30 PM UTC
                Category: Core : other
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any

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Details:

When an assert() test fails, the amount by which the tolerance is exceeded is
not reported.  Thus there can be error messages like:


error: ASSERT errors for:  assert (3,3.1,0.1)

  Location  |  Observed  |  Expected  |  Reason
     ()           3           3.1        Abs err 0.1 exceeds tol 0.1


which can confuse users who don't realize there is floating point arithmetic
at play.

This patch adds a little extra info at the end to give a hint that this is a
floating point math issue.  E.g.,


octave:1> assert(3, 3.1, 0.1)
error: ASSERT errors for:  assert (3,3.1,0.1)

  Location  |  Observed  |  Expected  |  Reason
     ()           3           3.1        Abs err 0.1 exceeds tol 0.1 by 8e-17




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File Attachments:


-------------------------------------------------------
Date: Wed 13 Sep 2017 04:29:31 PM UTC  Name:
octave-assert_print_tolerance_overrun-djs2017sep12.patch  Size: 3KiB   By:
sebald

<http://savannah.gnu.org/patch/download.php?file_id=41795>

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