MATLAB Function Reference

acos

Inverse cosine

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

acos uses FDLIBM, which was developed at SunSoft, a Sun Microsystems, Inc. business, by Kwok C. Ng, and others. For information about FDLIBM, see http://www.netlib.org.

See Also

acosh, cos

abs

acosh