9.19 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:

X	The 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:

Name	Argument	Return type	Standard
ASIN(X)	REAL(4) X	REAL(4)	Fortran 77 and later
DASIN(X)	REAL(8) X	REAL(8)	Fortran 77 and later

See also:

Inverse function: SIN Degrees function: ASIND