3.5.3.1.8 Erfc

Definition:

\(erfc = erfc(x)\) calculates an approximate value for the complement of the error function

\[erfc(x)=\frac 1{\sqrt{\pi }}\int_x^\infty e^{\frac{-u^2}2}du=1-{erf(x)}\]

The approximation is based on a Chebyshev expansion.

For more information please review the s15adc function in the NAG document.

Parameters:

x (input, double)

The argument x of the function.

erfc (output, double)

Approximate value of the complement of the error function.