3.5.2.4.5 Erfcx

Definition:

The y = erfcx(x) function is the scaled complementary error function, defined as

erfcx(x) = e^{x^2}\cdot erfc(x)

where erfc(x) is the complementary error function.

When x is very large, erfcx(x) is approximately \frac 1{\sqrt{\pi }\cdot x}.

Parameters:

x (input, double)
The argument x of the function.
y (output, double)
The approximate value of the scaled complementary error function.