log in Fortran Wiki

## Description
`log(x)` computes the natural logarithm of `x`, i.e. the logarithm to the base $e$.
## Standard
[[FORTRAN 77]] and later
## Class
[[Elemental procedure|Elemental function]]
## Syntax
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ {: lang=fortran }
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
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ {: lang=fortran }
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
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
category: intrinsics