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https://github.com/RobTillaart/Arduino.git
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126 lines
2.3 KiB
C++
126 lines
2.3 KiB
C++
//
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// FILE: fastTrig_test2.ino
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// AUTHOR: Rob Tillaart
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// PURPOSE: testing the itan functions
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// DATE: 2021-08-10
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// (c) : MIT
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#include "FastTrig.h"
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uint32_t start, d1, d2;
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volatile float x;
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int i;
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void setup()
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{
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Serial.begin(115200);
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Serial.println("start");
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test_tan(0);
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test_itan_error_1(false);
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Serial.println("done...\n");
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}
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void test_tan(int n)
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{
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Serial.println(__FUNCTION__);
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Serial.print("TAN\titan\t360 calls - offset: " );
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Serial.println(n);
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delay(10);
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start = micros();
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for ( i = n; i < n + 360; i++)
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{
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x = tan(i);
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}
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float t1 = (micros() - start) / 360.0;
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Serial.println(t1);
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delay(10);
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start = micros();
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for ( i = n; i < n + 360; i++)
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{
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x = itan(i);
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}
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float t2 = (micros() - start) / 360.0;
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Serial.println(t2);
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Serial.print(t2 / t1, 3);
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Serial.println("%");
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Serial.println();
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Serial.println();
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delay(10);
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}
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void test_itan_error_1(bool show)
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{
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Serial.println(__FUNCTION__);
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Serial.println("ITAN 0-3600 calls: \t");
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delay(10);
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float mx = 0;
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float mxr = 0;
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float z = 0;
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float zz = 0;
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for (int i = 0; i < 3600; i++)
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{
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if (((i + 900 ) % 1800) == 0) continue;
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float a = tan(i * 0.1 * PI / 180);
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float b = itan(i * 0.1);
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float y = abs(a - b); // abs error - rel error ~ 1%
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z += y;
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if (a > 0) zz += y / a; // not 100% correct but almost.
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if (mx < y) mx = y;
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if (show)
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{
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Serial.print(i);
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Serial.print("\t");
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Serial.print(a, 6);
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Serial.print("\t");
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Serial.print(b, 6);
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Serial.print("\t");
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Serial.print(a - b, 6);
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Serial.print("\t");
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Serial.println((a - b) / a, 6);
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}
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if (abs(a) > 0.00001 && mxr < y / a)
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{
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// Serial.print(i);
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// Serial.print('\t');
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// Serial.print(a, 6);
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// Serial.print('\t');
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// Serial.print(b, 6);
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// Serial.print('\t');
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// Serial.print(y/a, 6);
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// Serial.println();
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mxr = y / a;
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}
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}
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Serial.print("max abs error: ");
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Serial.println(mx, 8);
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Serial.print("avg abs error: ");
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Serial.println(z / 3600, 8);
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Serial.print("max rel error: ");
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Serial.println(mxr, 8);
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Serial.print("avg rel error: ");
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Serial.println(zz / 3600, 8);
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Serial.println();
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Serial.println();
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delay(10);
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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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