expmx2

eve::expmx2 = {}

inlineconstexpr

Callable object computing \(e^{-x^2}\).

Defined in Header

#include <eve/module/math.hpp>

Callable Signatures

namespace eve
{
   template< value T>
   T expmx2(T x) noexcept;                              //1
 
   template< eve::floating_value T >
   as_complex_t<T> expmx2(as_complex_t<T> z) noexcept;  //2
}

Parameters

• x: floating value.
• z: complex value.

Parameters

x: floating real or complex value.

Return value

Returns the elementwise exponential of minus the square of x

Example

#include <eve/module/math.hpp>
#include <eve/wide.hpp>
#include <iostream>
 
using wide_ft = eve::wide<float, eve::fixed<8>>;
 
int main()
{
 
  wide_ft pf = {0.0f, -0.0f, -1.0f, 1.0f, 2.0f,
               eve::inf(eve::as<float>()), eve::minf(eve::as<float>()), eve::nan(eve::as<float>())};
 
  std::cout << "---- simd" << '\n'
            << "<- pf               = " << pf << '\n'
            << "-> expx2(pf, -1.0f) = " << eve::expmx2(pf) << '\n';
 
  float xf = 1.0f;
 
  std::cout << "---- scalar" << '\n'
            << "<- xf        = " << xf << '\n'
            << "-> expx2(xf) = " << eve::expmx2(xf) << '\n';
  return 0;
}

Semantic Modifiers

• Masked Call

  The call eve::expmx2[mask](x, ...) provides a masked version of eve::expmx2 which is equivalent to if_else (mask, expmx2(x, ...), x).

  Example

  #include <eve/module/math.hpp>
  #include <eve/wide.hpp>
  #include <iostream>
   
  using wide_ft = eve::wide<float, eve::fixed<8>>;
   
  int main()
  {
    wide_ft pf = {0.0f, -0.0f, -1.0f, 1.0f, 20.0f,
                 eve::inf(eve::as<float>()), 4.0f, eve::nan(eve::as<float>())};
   
    std::cout << "---- simd" <<  '\n'
              << "<- pf                   = " << pf << '\n'
              << "-> expmx2[pf > 1.0](pf) = " << eve::expmx2[pf > 1.0](pf) << '\n';
    return 0;
  }