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cos

Cosine of argument in radians

Syntax

  • Y = cos(X)

Description

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

Examples

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Plot Cosine Function

Plot the cosine function over the domain $-\pi \leq x \leq \pi$ .

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

Cosine of Vector of Complex Angles

Calculate the cosine of the complex angles in vector x.

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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X — Input angle in radiansscalar value | vector | matrix | N-D array

Input angle in radians, specified as a real-valued or complex-valued scalar, vector, matrix or N-D array. The cos operation is element-wise when X is non-scalar.

Data Types: single | double
Complex Number Support: Yes

Output Arguments

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Y — Cosine of input anglescalar value | vector | matrix | N-D array

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

More About

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Cosine Function

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

The cosine of a complex angle, α, is

See Also

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