[Octave-bug-tracker] [bug #62329] Incorrect value (regression) for betainc

[Julien Bect]

URL:
  <https://savannah.gnu.org/bugs/?62329>

                 Summary: Incorrect value (regression) for betainc
                 Project: GNU Octave
            Submitted by: jbect
            Submitted on: lun. 18 avril 2022 05:33:52 UTC
                Category: Libraries
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Regression
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 7.1.0
         Discussion Lock: Any
        Operating System: GNU/Linux

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Details:

The following value is incorrect:

>> betainc(2e-20, 1, 0.5)
ans = 0


The result was correct in Octave 6.2.0:

octave:5> betainc(2e-20, 1, 0.5)
ans = 1.0000e-20
-verbatim+

The value 1e-20 is also the one I get in Python/scipy (scipy.special.betainc)
and R (pbeta).




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