9.21. ATAN

9.21 ATAN — Arctangent function

Description:

ATAN(X) computes the arctangent of X.

Standard:

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

Class:

Elemental function

Syntax:

RESULT = ATAN(X)

RESULT = ATAN(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.

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