MATLAB^®

acos - Inverse cosine; result in radians

Syntax

Y = acos(X)

Description

Y = acos(X) returns the inverse cosine (arccosine) for each element of X. For real elements of X in the domain , acos(X) is real and in the range . For real elements of X outside the domain , acos(X) is complex.

The acos function operates element-wise on arrays. The function's domains and ranges include complex values. All angles are in radians.

Examples

Graph the inverse cosine function over the domain .

x = -1:.05:1;
plot(x,acos(x)), grid on

Definition

The inverse cosine can be defined as

Algorithm