erfcInv function
Calculates the complementary inverse error function evaluated at z.
Implementation
double erfcInv(double z) {
if (z <= 0.0) {
return double.infinity;
}
if (z >= 2.0) {
return double.negativeInfinity;
}
double p, q, s;
if (z > 1) {
q = 2 - z;
p = 1 - q;
s = -1;
} else {
p = 1 - z;
q = z;
s = 1;
}
return _erfInvImpl(p, q, s);
}