8.19 ASIN — Arcsine function

Description:

ASIN(X) computes the arcsine of its X (inverse of SIN(X)).

Standard:

Fortran 77 and later, for a complex argument Fortran 2008 or later

Class:

Elemental function

Syntax:

RESULT = ASIN(X)

Arguments:
XThe type shall be either REAL and a magnitude that is less than or equal to one - or be COMPLEX.
Return value:

The return value is of the same type and kind as X. The real part of the result is in radians and lies in the range -\pi/2 \leq \Re \asin(x) \leq \pi/2.

Example:
program test_asin
  real(8) :: x = 0.866_8
  x = asin(x)
end program test_asin
Specific names:
NameArgumentReturn typeStandard
ASIN(X)REAL(4) XREAL(4)Fortran 77 and later
DASIN(X)REAL(8) XREAL(8)Fortran 77 and later
See also:

Inverse function:
SIN — Sine function
Degrees function:
ASIND — Arcsine function, degrees