Callable object computing the cosine from an input in \(\pi\) multiples.
Defined in Header
#include <eve/module/math.hpp>
{
template< eve::floating_value T >
template< eve::floating_value T >
as_complex_t<T>
cospi(as_complex_t<T> x)
noexcept;
}
constexpr callable_cospi_ cospi
Callable object computing the cosine from an input in multiples.
Definition: cospi.hpp:78
Definition: all_of.hpp:22
Parameters
Return value
- Returns the elementwise cosine of the input. The call
cospi(x)
is semantically equivalent to \(\cos(\pi x)\). In particular:
- If the element is \(\pm0\), \(1\) is returned.
- If the element is \(\pm\1/2\), \(0\) is returned.
- If the element is \(\pm\infty\), Nan is returned.
- If the element is a
Nan
, Nan
is returned.
- Returns elementwise the cosine of the input in \(\pi\) multiples.
Real version
#include <eve/module/math.hpp>
#include <eve/wide.hpp>
#include <iostream>
int main()
{
std::cout << "---- simd" << '\n'
<< "<- pf = " << pf << '\n'
;
float xf = 3.0f;
std::cout << "---- scalar" << '\n'
<< "<- xf = " << xf << '\n'
return 0;
}
constexpr callable_inf_ inf
Computes the infinity ieee value.
Definition: inf.hpp:58
Lightweight type-wrapper.
Definition: as.hpp:29
Wrapper for SIMD registers.
Definition: wide.hpp:65
Complex version
#include <eve/module/complex.hpp>
#include <eve/wide.hpp>
#include <iostream>
int main()
{
wide_ft ref = { 0.0f, 1.0f, -1.0f, 0.5f};
wide_ft imf = { 2.0f , -1.0, -5.0, 0.0};
auto z = eve::as_complex_t<wide_ft>(ref, imf);
std::cout
<< "---- simd" << std::endl
<< "<- z = " << z << std::endl
<<
"-> cospi(z) = " <<
eve::cospi(z) << std::endl;
return 0;
}