Manual Reference Pages - log (3fortran)
NAME
LOG(3) - [MATHEMATICS] Natural logarithm
SYNOPSIS
result = log(x)
elemental TYPE(kind=KIND) function log(x)TYPE(kind=KIND),intent(in) :: x
CHARACTERISTICS
o X may be any real or complex kind. o the result is the same type and characteristics as X.
DESCRIPTION
LOG(3) computes the natural logarithm of X, i.e. the logarithm to the base "e".
OPTIONS
o X : The value to compute the natural log of. If X is real, its value shall be greater than zero. If X is complex, its value shall not be zero.
RESULT
The natural logarithm of X. If X is the complex value (R,I) , the imaginary part "i" is in the range
-PI < i <= PIIf the real part of X is less than zero and the imaginary part of X is zero, then the imaginary part of the result is approximately PI if the imaginary part of PI is positive real zero or the processor does not distinguish between positive and negative real zero, and approximately -PI if the imaginary part of X is negative real zero.
EXAMPLES
Sample program:
program demo_log implicit none real(kind(0.0d0)) :: x = 2.71828182845904518d0 complex :: z = (1.0, 2.0) write(*,*)x, log(x) ! will yield (approximately) 1 write(*,*)z, log(z) end program demo_logResults:
2.7182818284590451 1.0000000000000000(1.00000000,2.00000000) (0.804718971,1.10714877)
STANDARD
FORTRAN 77
SEE ALSO
****(3)
fortran-lang intrinsic descriptions (license: MIT) @urbanjost
| Nemo Release 3.1 | log (3fortran) | April 28, 2024 |
