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fix issue #404: nan fp computation resulting in unreasonably large N in erf on some systems

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fredrik 2022-04-02 13:35:38 +02:00
parent 076249eaee
commit 7de55e6b43
1 changed files with 2 additions and 0 deletions
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arb_hypgeom/erf.c
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@ -97,6 +97,8 @@ arb_hypgeom_erf_1f1b(arb_t res, const arb_t z, slong prec)
dz = arf_get_d(arb_midref(z), ARF_RND_DOWN);
dz = fabs(dz);
u = -dz * dz + prec * LOG2 + log(dz);
if (dz < 1.0)
u = FLINT_MAX(u, 1e-6);
u = u / d_lambertw(u / (EXP1 * dz * dz));
N = u + 1;
}