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Fix for 10965 - extended normalDistribution domain support to +/-inf #10966

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thewilsonator merged 1 commit into from
Feb 28, 2026
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Fix for 10965 - extended normalDistribution domain support to +/-inf #10966

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5 changes: 5 additions & 0 deletions std/internal/math/errorfunction.d
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Original file line number Diff line number Diff line change
Expand Up @@ -984,6 +984,9 @@ Journal of Statistical Software <b>11</b>, (July 2004).
*/
real normalDistributionImpl(real a)
{
if (a is -real.infinity) return 0.0L;
if (a is real.infinity) return 1.0L;

real x = a * SQRT1_2;
real z = fabs(x);

Expand All @@ -1005,6 +1008,8 @@ real normalDistributionImpl(real a)
{
assert(fabs(normalDistributionImpl(1L) - (0.841344746068543L)) < 0.0000000000000005L);
assert(isIdentical(normalDistributionImpl(NaN(0x325)), NaN(0x325)));
assert(normalDistributionImpl(-real.infinity) == 0.0L);
assert(normalDistributionImpl(real.infinity) == 1.0L);
}

/*
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