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 $\frac 1{\sqrt{\pi }\cdot x}$ .

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

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