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Manual Reference Pages  - erf (3)

NAME
erf(3f) - [FORTRAN:INTRINSIC:MATHEMATICS] Error function

DESCRIPTION
erf(x) computes the error function of X, defined as $$ \text{erf}(x) = \frac{2}{\sqrt{\pi}} \int_0**x e**{-t**2} dt. $$

SYNTAX
result = erf(x)

ARGUMENTS
X The type shall be REAL.

RETURN VALUE
The return value is of type REAL, of the same kind as X and lies in the range -1 <= erf(x) <= 1 .

EXAMPLE
Sample program: 

    program demo_erf
    use, intrinsic :: iso_fortran_env, only : real_kinds, &
    & real32, real64, real128
    implicit none
    real(kind=real64) :: x = 0.17_real64
      x = erf(x)
    end program demo_erf

STANDARD
[[Fortran 2008]] and later

CLASS
[[Elemental procedure|Elemental function]]

erf (3) March 11, 2021
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