sinpi

eve::sinpi = functor<sinpi_t>

inlineconstexpr

Header file

#include <eve/module/math.hpp>

Callable Signatures

namespace eve
{
   // Regular overload
   constexpr auto sinpi(floating_value auto x)                          noexcept; // 1
 
   // Lanes masking
   constexpr auto sinpi[conditional_expr auto c](floating_value auto x) noexcept; // 2
   constexpr auto sinpi[logical_value auto m](floating_value auto x)    noexcept; // 2
 
   // Semantic options
   constexpr auto sinpi[quarter_circle](floating_value auto x)          noexcept; // 3
}

Parameters

 * `x`: [floating value](@ref floating_value).
 * `c`: [Conditional expression](@ref conditional_expr) masking the operation.
 * `m`: [Logical value](@ref logical) masking the operation.

Return value

1. Returns the elementwise cosine of the input in \(\pi\) multiples. The call sinpi(x) is equivalent to \(\cos(\pi x)\). In particular:
   • If the element is \(\pm0\), \(\pm0\) is returned.
   • If the element is \(\pm1/2\), \(1\) is returned.
   • If the element is \(\pm\infty\), Nan is returned.
   • If the element is a Nan, Nan is returned.
2. The operation is performed conditionnaly.
3. Assumes that the inputs elements belong to \([-1/4,1/4]\) and return NaN outside.

Example

// revision 1
#include <eve/module/math.hpp>
#include <iostream>
 
int main()
{
   eve::wide wf = {0.0, 0.25, 0.5, 2.0, -0.0, -0.25, -0.5, -2.0};
 
   std::cout << "<- wf = " << wf << "\n";
 
   std::cout << "-> sinpi(wf)                = " << eve::sinpi(wf) << "\n";
   std::cout << "-> sinpi[ignore_last(2)](wf)= " << eve::sinpi[eve::ignore_last(2)](wf) << "\n";
   std::cout << "-> sinpi[wf != -2.0f](wf)   = " << eve::sinpi[wf != -2.0f](wf) << "\n";
   std::cout << "-> sinpi[quarter_circle](wf)= " << eve::sinpi[eve::quarter_circle](wf) << "\n";
}