is_not_equal

eve::is_not_equal = {}

inlineconstexpr

Returns a logical true if and only if the element value are not equal.

Defined in Header

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
   template< eve::value T, eve::value U >
   auto is_not_equal(T x, U y) noexcept;
}

Parameters

• x, y : arguments

Return value

Returns the logical value containing the elementwise equality test result between x and y. The infix notation x != y can also be used.

Note

Although the infix notation with == is supported, the != operator on standard scalar types is the original one and so returns bool result, not eve::logical.

Example

#include <eve/module/core.hpp>
#include <eve/wide.hpp>
#include <iostream>
 
using wide_ft = eve::wide<float, eve::fixed<4>>;
 
int main()
{
  wide_ft pf = {0.0f, 1.0f, -1.0f, -2.0f};
  wide_ft qf = {1.0f, -1.0f, -1.0f, -2.0f};
 
  std::cout << "---- simd" << '\n'
            << "<- pf                   = " << pf << '\n'
            << "<- qf                   = " << qf << '\n'
            << "-> is_not_equal(pf, qf) = " << eve::is_not_equal(pf, qf) << '\n';
 
  float xf = 1.0f;
  float yf = 2.0f;
 
  std::cout << "---- scalar" << '\n'
            << "<- xf                   = " << xf << '\n'
            << "<- yf                   = " << yf << '\n'
            << "-> is_not_equal(xf, yf) = " << eve::is_not_equal(xf, yf) << '\n';
  return 0;
}

Semantic Modifiers

• Masked Call

  The call eve::is_not_equal[mask](x) provides a masked version of eve::is_not_equal which is equivalent to `if_else (mask, is_not_equal(x, y), false_

  Example

  #include <eve/module/core.hpp>
  #include <eve/wide.hpp>
  #include <iostream>
   
  using wide_ft = eve::wide<float, eve::fixed<4>>;
   
  int main()
  {
    wide_ft pf = {0.0f, 1.0f, -1.0f, -2.0f};
    wide_ft qf = {1.0f, -1.0f, -1.0f, -2.0f};
   
    std::cout << "---- simd" << '\n'
              << "<- pf                              = " << pf << '\n'
              << "<- qf                              = " << qf << '\n'
              << "-> is_not_equal[pf > 0.5f](pf, qf) = " << eve::is_not_equal[pf > 0.5f]((pf, qf) << '\n';
    return 0;
  }

eve::numeric

The expression numeric(is_not_equal)(x,y) considers that Nan values are not equal.

Example

• definitely

  The expression definitely(is_not_equal)(x, y, t) where x and y must be floating point values, evals to true if and only if x is almost equal to y. This means that:

  • if t is a floating_value then the relative error of not confusing is x and y is greater than t \((|x-y| \ge t \max(|x|, |y|))\).
  • if t is a positive integral_value then there are more than t values of the type of x representable in the interval \([x,y[\).
  • if t is omitted then the tolerance t is taken to 3 times the machine \(\epsilon\) in the x type (3*eps(as(x))).

  Example

  #include <eve/module/core.hpp>
  #include <eve/wide.hpp>
  #include <iostream>
   
  using wide_ft = eve::wide<float, eve::fixed<4>>;
   
  int main()
  {
    wide_ft pf = {1.0f, 1.0f, -1.0f, -2.0f};
    wide_ft qf = {1.0f, -1.0f, -1.0f, -2.0f};
    pf += 3*eve::eps(eve::as<float>());
   
    std::cout << "---- simd" << '\n'
              << "<- pf                                     = " << pf << '\n'
              << "<- qf                                     = " << qf << '\n'
              << "-> is_not_equal)(pf, qf)                  = " << eve::is_not_equal(pf, qf) << '\n'
              << "-> definitely(is_not_equal)(pf, qf)       = " << eve::definitely(eve::is_not_equal)(pf, qf) << '\n'
              << "-> definitely(is_not_equal)(pf, qf, 2)    = " << eve::definitely(eve::is_not_equal)(pf, qf, 2) << '\n'
              << "-> definitely(is_not_equal)(pf, qf, 2.0f) = " << eve::definitely(eve::is_not_equal)(pf, qf, 2.0f) << '\n';
    return 0;
  }