MATLAB Function Reference

acos, acosh

Inverse cosine and inverse hyperbolic cosine

Syntax

Y = acos(X)
Y = acosh(X)

Description

The acos and acosh functions operate element-wise on arrays. The functions' domains and ranges include complex values. All angles are in radians.

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.

Y = acosh(X) returns the inverse hyperbolic cosine for each element of X.

Examples

Graph the inverse cosine function over the domain and the inverse hyperbolic cosine function over the domain

x = -1:.05:1; plot(x,acos(x))
x = 1:pi/40:pi; plot(x,acosh(x))

Algorithm

See Also

cos, cosh

abs

acot, acoth