| MATLAB Functions | Help Desk |
acos, acosh
Inverse cosine and inverse hyperbolic cosine
Y = acos(X) Y = acosh(X)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.
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))
cos, cosh Cosine and hyperbolic cosine