<< cosm

Trigonometric functions

cot >>

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cospi

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Computes cos(X * pi) accurately.

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Syntax

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res = cospi(x)

Input argument

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x

a numeric value

Output argument

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res

a numeric value

Description

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res = cospi(x) computes cos(x * pi) accurately.

For integers, cospi(x) is +1 or -1.

For odd integers, cospi(x / 2) is exactly zero.

Example

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x = [0, 1/2, 1, 3/2, 2];
r = cos(x * pi)
res = cospi(x)

See also

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cos, sinpi.

History

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Version	Description
1.0.0	initial version

Author

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Allan CORNET