Intel® Fortran Compiler Classic and Intel® Fortran Compiler Developer Guide and Reference

ID 767251
Date 7/13/2023
Public

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Document Table of Contents

ACOS

Elemental Intrinsic Function (Generic): Produces the arccosine of x.

result = ACOS (x)

x

(Input) Must be of type real, where | x | must be less than or equal to 1, or of type complex.

Results

The result type and kind are the same as x and is expressed in radians.

If the result is real, the value is expressed in radians and lies in the range 0 <= ACOS(X) <= pi.

If the result is complex, the real part is expressed in radians and lies in the range 0 <= REAL(ACOS (x)) <= pi.

Specific Name

Argument Type

Result Type

ACOS 1

REAL(4)

REAL(4)

DACOS 1

REAL(8)

REAL(8)

QACOS 2

REAL(16)

REAL(16)

1The setting of compiler options specifying real size can affect ACOS and DACOS.

2Or QARCOS.

Example

ACOS (0.68032123) has the value .8225955.