[Octave-bug-tracker] [bug #60528] betaincinv throws error for some valid inputs

[Markus Mützel]

Update of bug #60528 (project octave):

                  Status:                   Fixed => In Progress            
             Open/Closed:                  Closed => Open                   

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Follow-up Comment #4:

I'm seeing two regressions on Windows with the newly added tests:

>>>>> processing C:\Program Files\GNU
Octave\Octave-7.0.0\mingw64\share\octave\7.0.0\m\specfun\betaincinv.m
***** assert <*60528> (betaincinv (1-1e-6, 3, 1), 0.999999666666556, 2*eps)
!!!!! regression: https://octave.org/testfailure/?60528
ASSERT errors for:  assert (betaincinv (1 - 1e-6, 3, 1),0.999999666666556,2 *
eps)

  Location  |  Observed  |  Expected  |  Reason
     ()           1            1         Abs err 5.5511e-16 exceeds tol
4.4409e-16 by 1e-16
***** assert <*60528> (betaincinv (1-1e-6, 3, 1,"upper"), .01000000000003977,
2*eps)
!!!!! regression: https://octave.org/testfailure/?60528
ASSERT errors for:  assert (betaincinv (1 - 1e-6, 3, 1,
"upper"),.01000000000003977,2 * eps)

  Location  |  Observed  |  Expected  |  Reason
     ()          0.01         0.01       Abs err 1.4074e-14 exceeds tol
4.4409e-16 by 1e-14


The first one is quite close to the tolerance. So, could we just relax it?

The second one is further off from the expected value. (Is this a literature
value?):

>> betaincinv (1 - 1e-6, 3, 1, "upper")
ans = 1.000000000005384e-02



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