Fortran Wiki
log

Description

log(x) computes the natural logarithm of x, i.e. the logarithm to the base $e$.

Standard

FORTRAN 77 and later

Class

Elemental function

Syntax

result = log(x)

Arguments

• x - The type shall be real or complex.

Return value

The return value is of type real or complex. The kind type parameter is the same as x. If x is complex, the imaginary part $\omega$ is in the range $-\pi \lt \omega \leq \pi$.

Example

program test_log
  real :: x = 2.7182818284590451_8
  complex :: z = (1.0, 2.0)
  x = log(x)    ! will yield (approximately) 1
  z = log(z)
end program test_log