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8.29 ATAND — Arctangent function, degrees ¶

Synopsis:

RESULT = ATAND(X)

RESULT = ATAND(Y, X)

Description:

ATAND(X) computes the arctangent of X in degrees (inverse of TAND — Tangent function, degrees).

Class:

Elemental function

Arguments:

X	The type shall be REAL.
Y	The type and kind type parameter shall be the same 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 ATAN2D(Y, X). Otherwise, the result is in degrees and lies in the range -90 \leq \atand(x) \leq 90.

Example:

program test_atand
  real(8) :: x = 2.866_8
  real(4) :: x1 = 1.e0_4, y1 = 0.5e0_4
  x = atand(x)
  x1 = atand(y1, x1)
end program test_atand

Specific names:

Name	Argument	Return type	Standard
ATAND(X)	REAL(4) X	REAL(4)	Fortran 2023
DATAND(X)	REAL(8) X	REAL(8)	GNU extension

Standard:

Fortran 2023

See also:

Inverse function:
TAND — Tangent function, degrees
Radians function:
ATAN — Arctangent function