MATLAB Function Reference Volume 1: A - E - Bad Request

acos, acosh
2acos, acosh
Purpose 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.
2-28
Y = acos(X) returns the inverse cosine (arccosine) for each element of X. For
real elements of X in the domain [ – 11 , ] , acos(X) is real and in the range
[ 0, π]
. For real elements of X outside the domain [ – 11 , ] , 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 – 1 ≤ x ≤ 1, and the inverse
hyperbolic cosine function over the domain 1 ≤ x ≤ π.
y=acos(x)
3.5
2.5
1.5
0.5
x = -1:.05:1; plot(x,acos(x))
x = 1:pi/40:pi; plot(x,acosh(x))
3
2
1
0
-1 -0.8 -0.6 -0.4 -0.2 0
x
0.2 0.4 0.6 0.8 1
y=acosh(x)
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
1 1.5 2 2.5 3 3.5
x