Documentation

cos

Cosine of argument in radians

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Syntax

Y = cos(X)

Description

Y= cos(X)returns the cosine for each element ofX. Thecosfunction operates element-wise on arrays. The function accepts both real and complex inputs. For purely real values or imaginary values ofX,cosreturns real values in the interval [-1 ,1]. For complex values ofX,cosreturns complex values. All angles are in radians.

Examples

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Open Live Script

Plot the cosine function over the domain.

x = -pi:0.01:pi; plot(x,cos(x)) gridon

Open Live Script

Calculate the cosine of the complex angles in vectorx.

x = [-i pi+i*pi/2 -1+i*4]; y = cos(x)
y = 1.5431 + 0.0000i -2.5092 - 0.0000i 14.7547 +22.9637i

Input Arguments

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Input angle in radians, specified as a scalar, vector, matrix, or multidimensional array.

Data Types:single|double
Complex Number Support:Yes

Output Arguments

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Cosine of input angle, returned as a real-valued or complex-valued scalar, vector, matrix or multidimensional array.

More About

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Cosine Function

The cosine of an angle, α, defined with reference to a right angled triangle is

cos ( α ) = adjacent side hypotenuse = b h .

The cosine of a complex angle, α, is

cos ( α ) = e i α + e − i α 2 .

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.

See Also

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Introduced before R2006a

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