ERFC intrinsic function
Standard: F77 F90 F95 F2003 F2008 Example Program
ERFC ( X )

X : Real;

Result : Same type and kind as X.
The value of the result is an approximation to the “complementary error function” of X; that is mathematically equal to 1.0−ERF(X). Like many intrinsic functions, this is elemental; the result has the same shape as X, with the operation being applied elementwise.

This function converges to 0.0 quickly with increasing X.

ERF intrinsic function, ERFC_SCALED intrinsic function.