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1F1: correct hypergeometric_1F1_backwards_recursion_on_b_for_negative_a for the case where b > 0.

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jzmaddock
2019-02-03 18:52:46 +00:00
parent 4f0f6817e0
commit bc96c5c44f
1 changed files with 1 additions and 1 deletions
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include/boost/math/special_functions/detail/hypergeometric_1F1_recurrence.hpp
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@@ -217,7 +217,7 @@
if (a_shift > static_cast<boost::intmax_t>(boost::math::policies::get_max_series_iterations<Policy>()))
return boost::math::policies::raise_evaluation_error<T>(function, "1F1 arguments sit in a range with a so negative that we have no evaluation method, got a = %1%", a, pol);
int a_b_shift = itrunc(b + b_shift); // The max we can shift on a and b together
int a_b_shift = b < 0 ? itrunc(b + b_shift) : b_shift; // The max we can shift on a and b together
int leading_a_shift = 3; // Just enough to make a negative
if (a_b_shift > a_shift - 3)
{