<Syntax> 



ERF ( X )
X : Real;
Result : Same type and kind as X.






<Semantics> 



The value of the result is an approximation to the “error function” of X; that is 2/SQRT(π) times the integral from 0 to X of e^{−t**2}dt.
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 1.0 extremely rapidly with increasing X.






<Related> 



ERFC intrinsic function,
ERFC_SCALED intrinsic function.


