/GNU Fortran 7

# 9.24 ATAND — Arctangent function, degrees

Description:

ATAND(X) computes the arctangent of X in degrees (inverse of TAND).

This function is for compatibility only and should be avoided in favor of standard constructs wherever possible.

Standard:

GNU Extension, enabled with -fdec-math.

Class:

Elemental function

Syntax:
 RESULT = ATAND(X) RESULT = ATAND(Y, X)
Arguments:
 X The type shall be REAL or COMPLEX; if Y is present, X shall be REAL. Y shall be of the same type and kind as X.
Return value:

The return value is of the same type and kind as X. If Y is present, the result is identical to ATAND2(Y,X). Otherwise, it is the arcus tangent of X, where the real part of the result is in degrees and lies in the range -90 \leq \Re \atand(x) \leq 90.

Example:
program test_atand
real(8) :: x = 2.866_8
x = atand(x)
end program test_atand
Specific names:
 Name Argument Return type Standard ATAND(X) REAL(4) X REAL(4) GNU Extension DATAND(X) REAL(8) X REAL(8) GNU Extension