ATAN(X)

Purpose

Arctangent (inverse tangent) function.

Class

Elemental function

Argument type and attributes

X
must be of type real.

Result type and attributes

Same as X.

Result value

Examples

ATAN (1.0) approximates PI/4.

Specific Name Argument Type Result Type Pass As Arg?
ATAN default real default real yes
DATAN double precision real double precision real yes
QATAN  1  REAL(16) REAL(16) yes
Notes:
  1. IBM Extension.