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[Octave-bug-tracker] [bug #53543] regression: new gammainc inaccurate fo

From: Mike Miller
Subject: [Octave-bug-tracker] [bug #53543] regression: new gammainc inaccurate for small real inputs
Date: Sun, 1 Apr 2018 15:30:48 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:59.0) Gecko/20100101 Firefox/59.0

Follow-up Comment #1, bug #53543 (project octave):

I saw a case in gammainc.m:

  elseif (strcmp (tail, "scaledlower"))
    if (abs (x) < 1/2)
      y = expm1 (x) ./ x;
      y = (exp (x) - 1) ./ x;

But there is no equivalent for the case a few lines above

  if (strcmp (tail, "lower"))
    y = 1 - exp (-x);

which is the case that this bug report is about.


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