cospi

Computes cos(X * pi) accurately.

📝 Syntax

• res = cospi(x)

📥 Input argument

• x - a numeric value

📤 Output argument

• res - a numeric value

📄 Description

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

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

🔗 See also

cos, sinpi.

🕔 History

Version	📄 Description
1.0.0	initial version