erf_inv

auto eve::erf_inv = functor<erf_inv_t>

inlineconstexpr

Header file

#include <eve/module/special.hpp>

Callable Signatures

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

Parameters

• x: floating value
• c: Conditional expression masking the operation.
• m: Logical value masking the operation.

Return value

1. The value y such that erf(y)==x is returned. For x outside of \([-1,1]\), the result is NaN.
2. The operation is performed conditionnaly.

External references

• Wolfram MathWorld: Inverse Erf
• Wikipedia: Error Function

Example

// revision 1
#include <eve/module/special.hpp>
#include <iostream>
 
int main()
{
  eve::wide wf = { 0.0, -0.0, 1.0, -1.0, -0.5, 0.5, 0.75, -0.75};
 
  std::cout << "<- wf                         = " << wf << "\n";
 
  std::cout << "-> erf_inv(wf)                = " << eve::erf_inv(wf) << "\n";
  std::cout << "-> erf_inv[ignore_last(2)](wf)= " << eve::erf_inv[eve::ignore_last(2)](wf) << "\n";
  std::cout << "-> erf_inv[wf >= 0.0](wf)     = " << eve::erf_inv[wf >= 0.0](wf) << "\n";
}