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BUG: Fixes precision issues with stats.tukeylambda distribution #79

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BUG: Fixes precision issues with stats.tukeylambda distribution #79

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7128d2d
Fixes precision issues with
JacobHass8 Dec 8, 2025
9414387
Merge branch 'scipy:main' into tukey_precision
JacobHass8 Jan 7, 2026
c58bf06
Added conditional tolerance
JacobHass8 Jan 7, 2026
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6 changes: 5 additions & 1 deletion include/xsf/cephes/tukey.h
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Original file line number Diff line number Diff line change
Expand Up @@ -21,7 +21,7 @@ namespace cephes {
namespace detail {

constexpr double tukey_SMALLVAL = 1e-4;
constexpr double tukey_EPS = 1.0e-14;
double tukey_EPS = 1.0e-14;
constexpr int tukey_MAXCOUNT = 60;

} // namespace detail
Expand All @@ -44,6 +44,10 @@ namespace cephes {
}
}

if (x > 1e9){
detail::tukey_EPS = 1.0e-18;
}

if ((-detail::tukey_SMALLVAL < lmbda) && (lmbda < detail::tukey_SMALLVAL)) {
if (x >= 0) {
return 1.0 / (1.0 + std::exp(-x));
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