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https://github.com/RobTillaart/Arduino.git
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146 lines
3.0 KiB
C++
146 lines
3.0 KiB
C++
//
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// FILE: permutations.ino
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// AUTHOR: Rob Tillaart
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// PURPOSE: demo
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// DATE: 2021-08-06
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// URL: https://github.com/RobTillaart/statHelpers
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#include "statHelpers.h"
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#include "printHelpers.h"
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uint32_t start, duration1, duration2;
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volatile uint32_t x;
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void setup()
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{
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Serial.begin(115200);
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Serial.println(__FILE__);
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///////////////////////////////////////////
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Serial.println("permutations64(n, k)");
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start = micros();
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for (int n = 0; n < 20; n++)
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{
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for (int k = 0; k <= n; k++)
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{
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// x = permutations64(n, k);
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Serial.print(n);
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Serial.print('\t');
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Serial.print(k);
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Serial.print('\t');
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Serial.print(print64(permutations64(n, k)));
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Serial.println();
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}
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Serial.println();
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}
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duration1 = micros() - start;
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Serial.println(duration1);
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Serial.println();
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///////////////////////////////////////////
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//
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// tests are commented as they take serious time.
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/*
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Serial.println("dpermutations(n, k) - double can be 4 or 8 bit.");
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start = micros();
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int nmax = 34;
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if (sizeof(double) == 8) nmax = 170; // Exponent overflow in double
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for (int n = 0; n <= nmax; n++)
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{
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for (int k = 0; k <= n; k++)
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{
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// x = dpermutations(n, k);
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Serial.print(n);
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Serial.print('\t');
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Serial.print(k);
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Serial.print('\t');
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Serial.print(sci(dpermutations(n, k), 15));
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Serial.println();
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}
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Serial.println();
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}
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duration1 = micros() - start;
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Serial.println(duration1);
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Serial.println();
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*/
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/* takes 40 seconds ...
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Serial.println("bigPermutations(n, k, mant, expo)");
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start = micros();
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nmax = 30;
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// if (sizeof(double) == 8) nmax = 170;
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for (int n = 0; n <= nmax; n++)
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{
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for (int k = 0; k <= n; k++)
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{
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double mant = 0;
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uint32_t expo = 0;
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bigPermutations(n, k, mant, expo);
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Serial.print(n);
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Serial.print('\t');
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Serial.print(k);
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Serial.print('\t');
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Serial.print(mant, 15);
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Serial.print('E');
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Serial.print(expo);
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Serial.println();
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}
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Serial.println();
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}
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duration1 = micros() - start;
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Serial.println(duration1);
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Serial.println();
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*/
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/*
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Serial.println("bigPermutations(n, k, mant, expo)");
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start = micros();
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for (int n = 1000; n <= 10000; n += 1000)
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{
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for (int k = 0; k <= n; k += n / 4)
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{
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double mant = 0;
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uint32_t expo = 0;
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bigPermutations(n, k, mant, expo);
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Serial.print(n);
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Serial.print('\t');
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Serial.print(k);
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Serial.print('\t');
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Serial.print(mant, 15);
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Serial.print('E');
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Serial.print(expo);
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Serial.println();
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}
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Serial.println();
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}
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duration1 = micros() - start;
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Serial.println(duration1);
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Serial.println();
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*/
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// pick 1000 persons from 4294967295 (maxLong)
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double mant = 0;
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uint32_t expo = 0;
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bigPermutations(4294967295, 1000, mant, expo);
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Serial.print(mant, 15);
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Serial.print('E');
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Serial.print(expo);
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Serial.println();
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Serial.println("\nDone...");
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}
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void loop()
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{
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}
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// -- END OF FILE --
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