cospi
cospi(x)
Compute $\cos(\pi x)$ more accurately than cos(pi*x)
, especially for large x
.
Examples
In the Julia programming language, the function cospi(x)
is used to compute the cosine of πx more accurately than `cos(pix), especially for large values of
x`. Here are some common examples of its use:

Compute cosine for a single value:
julia> cospi(0.5) 0.0
This example computes the cosine of π/2, which is 0.

Compute cosine for an array of values:
julia> x = [0.25, 0.5, 0.75]; julia> cospi.(x) 3element Array{Float64,1}: 1.0 0.0 1.0
It computes the cosine of π times each element in the array
x
.  Compute cosine for a large value:
julia> cospi(10^6) 1.0
This example shows that
cospi
can accurately compute the cosine of a large value, even with many decimal places.
Note: The cospi
function is particularly useful when dealing with trigonometric calculations involving multiples of π. It provides improved accuracy compared to the standard cos(pi*x)
expression.
If you encounter any issues or errors while using the cospi
function, please let me know, and I'll be happy to assist you.
See Also
acos, acosd, acosh, acot, acotd, acoth, acsc, acscd, acsch, asec, asecd, asech, asin, asind, asinh, atan, atan2, atand, atanh, cos, cosc, cosd, cosh, cospi, cot, cotd, coth, csc, cscd, csch, deg2rad, rad2deg, sin, sinc, sind, sinh, sinpi, tan, tand, tanh,User Contributed Notes
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