acos

Inverse cosine in radians

Usage

acos(A)

• A should be an array, which can be real or complex.
• It returns an array containing the inverse cosine (in radians) of each element of A.
• For real elements of A lying in $[-1,1]$, it returns values in $[0,\pi]$​. (See example below.)
• For real elements of A having absolute value $>1$, it returns complex numbers.
• The output has the same size as A.

Example

Input

x = linspace(-1,1);
y = acos(x);
plot(x,y,'.-');
xlabel('x')
ylabel('acos(x)')

Output