exp2 (Core Functions)


Import

#include <archr/core/exp2.h>
#include <archr/core/exp2.hpp>
import archr.core
atomsLoads('archr')

Synopsis

 float archr_core_exp2_1f32(const float i1);
(1)
 double archr_core_exp2_1f64(const double i1);
(2)
 void archr_core_exp2_f32(float *o0, const float *i1, size_t sz);
(3)
 void archr_core_exp2_f64(double *o0, const double *i1, size_t sz);
(4)
 float exp2(const float i1);
(1)
 double exp2(const double i1);
(2)
 void exp2(const float *i1, size_t sz, float *o0);
(3)
 void exp2(const double *i1, size_t sz, double *o0);
(4)
template <typename Range> void exp2(const Range& i1, Range& o0);
(5)
subroutine archr_core_exp2_1f32(real(4) :: r, real(4), parameter :: i1)
(1)
subroutine archr_core_exp2_1f64(real(8) :: r, real(8), parameter :: i1)
(2)
subroutine archr_core_exp2_f32(real(4), dimension(*), parameter :: i1, integer(4) :: sz, real(4), dimension(*) :: o0)
(3)
subroutine archr_core_exp2_f64(real(8), dimension(*), parameter :: i1, integer(4) :: sz, real(8), dimension(*) :: o0)
(4)
def exp2(i1):
    return o0
(1)
function o0 = archr_core_exp2(i1)
(1)

Description

Computes the Base-Two Exponential:

Parameters

i1_first, i1_last

The range of input elements

o0

The beginning of the destination range, may be equal to i1

i1

The scalar/contiguous data input element

Example


#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stddef.h>
#include <archr/core/exp2.h>

double rand_in(double min, double max) {
  return min + ((double)(max - min) * ((double)rand() / RAND_MAX));
}

int main() {
  time_t t;
  size_t i;
  size_t sz = 10;
  float* i1 = (float*)malloc(sz * sizeof(float));
  float* o1 = (float*)malloc(sz * sizeof(float));

  srand((unsigned int)time(&t));
  for (i = 0; i < sz; ++i) {
    i1[i] = (float)rand_in((float)-10, (float)10);
  }
  archr_core_exp2_f32(o1, i1, sz);
  for (i = 0; i < sz; ++i) {
    printf("%4lu: exp2(%f) = %f\n", i, (double)i1[i], (double)o1[i]);
  }
}

Possible Output

   0: exp2(9.422858) = 686.377441
   1: exp2(1.837882) = 3.574848
   2: exp2(-3.262253) = 0.104223
   3: exp2(-7.822172) = 0.004419
   4: exp2(-5.006380) = 0.031112
   5: exp2(-8.051063) = 0.003770
   6: exp2(4.945784) = 30.819757
   7: exp2(9.347142) = 651.283691
   8: exp2(5.106514) = 34.451965
   9: exp2(6.345078) = 81.294083

#include <ctime>
#include <cstdio>
#include <cstdlib>
#include <cstdint>
#include <cstddef>
#include <vector>
#include <algorithm>
#include <iomanip>
#include <iostream>
#include <archr/core/exp2.hpp>

double rand_in(double min, double max) {
  return min + (double(max - min) * (double(std::rand()) / RAND_MAX));
}

int main() {
  std::size_t i;
  std::size_t sz = 10;
  std::vector<float> i1(sz);
  std::vector<float> o1(sz);

  std::srand(std::time(0));
  std::generate(i1.begin(), i1.end(), []() { return rand_in(float(-10), float(10)); });
  archr::core::exp2(i1.data(), sz, o1.data());
  for (i = 0; i < sz; ++i) {
    std::cout << std::setw(4) << i << ": " << "exp2" << "(" << i1[i] << ")" << " = " << o1[i] << std::endl;
  }
}

Possible Output

   0: exp2(-7.82005) = 0.00442519
   1: exp2(-6.5429) = 0.0107248
   2: exp2(-9.37116) = 0.00151008
   3: exp2(5.69177) = 51.6885
   4: exp2(6.16947) = 71.9772
   5: exp2(7.46037) = 176.114
   6: exp2(-2.36809) = 0.193702
   7: exp2(-6.72507) = 0.00945261
   8: exp2(8.9037) = 478.94
   9: exp2(-5.45268) = 0.0228338

program main
  integer(4), parameter  :: sz = 10
  real(4), dimension(sz) :: o0
  real(4), dimension(sz) :: i0
  real(8)                :: r0, r1
  real(8)                :: min0, max0
  real(8)                :: min1, max1
  real(8)                :: min2, max2
  ! Init:
    min0 = -10
    max0 = 10
  do i=1,sz
    r0 = random_in(min0, max0)
    i0(i) = r0
  end do
  ! Example:
  call archr_core_exp2_f32(o0, i0, size(i0))
  ! Output:
  do i=1,sz
    print *, i, ": ", o0(i)
  end do
contains
  ! Generate a random number within a range
  function random_in(mn, mx) result(r)
    real(8) :: r
    real(8), intent(in) :: mn, mx
    r = mn + (rand() * (mx - mn))
  end function random_in
end program

Possible Output

           1 :    9.76665760E-04
           2 :    6.04833383E-03
           3 :    34.5857162    
           4 :   0.563701093    
           5 :    1.57498837    
           6 :    2.03219391E-02
           7 :    1.87471928E-03
           8 :    11.9363480    
           9 :    12.0080090    
          10 :    414.106262