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1F1: large z case: can't have b-a as a negative integer.

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jzmaddock
2019-02-12 18:09:14 +00:00
parent 9eb6d5fc58
commit fa3e94ff79
1 changed files with 2 additions and 0 deletions
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include/boost/math/special_functions/detail/hypergeometric_asym.hpp
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@@ -126,6 +126,8 @@
}
else if (fabs((1 - (b - a) + half_digits) * (a + half_digits) / (half_digits * z)) < 0.7)
{
if ((floor(b - a) == (b - a)) && (b - a < 0))
return false; // Can't have a negative integer b-a.
in_region = true;
//
// double check that we are not divergent at the start if a,b < 0: