This is machine translation

Translated by Microsoft
Mouse over text to see original. Click the button below to return to the English verison of the page.

라이선스가 부여된 사용자만 번역 문서를 볼 수 있습니다. 번역 문서를 보려면 로그인하십시오.


Inverse cosine in radians




y = acos(x) returns the Inverse Cosine (cos-1) of the elements of x. The acos function operates element-wise on arrays. For real elements of x in the interval [-1,1], acos(x) returns real values in the interval [0,pi]. For real values of x outside the interval [-1,1] and for complex values of x, acos(x) returns complex values. All angles are in radians.


collapse all

ans =


Find the inverse cosine of the elements of vector x. The acos function acts on x element-wise.

x = [0.5i 1+3i -2.2+i];
y = acos(x)
y =

   1.5708 - 0.4812i   1.2632 - 1.8642i   2.6799 - 1.5480i

Plot the inverse cosine function over the domain $-1 \le x \le 1$.

x = -1:.05:1;
grid on

Input Arguments

collapse all

Numeric input, specified as a number, vector, matrix, or multidimensional array.

Data Types: single | double
Complex Number Support: Yes

More About

collapse all

Inverse Cosine

The inverse cosine is defined as


Tall Array Support

This function fully supports tall arrays. For more information, see Tall Arrays.

See Also

| |

Introduced before R2006a

Was this topic helpful?