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RHC.cpp
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RHC.cpp
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#include <cmath>
#include <iostream>
#include <string>
// I broke this down into parts to be more sure I was doing it right
double EvaluatePoints(double _x, double _y, int &_counter){
double a = -(_y + 47);
double b = fabs((_x/2) + _y + 47);
double c = fabs(_x - (_y + 47));
double sqB = sqrt(b);
double sqC = sqrt(c);
_counter++;
return (a * sin(sqB)) - (_x * sin(sqC));
}
void RHC(double _sp[2], int _p, double _z, int _seed, double (&_out)[2], int &_counter, double &_outVal){
// Set seed
srand(_seed);
// Copy starting point to output array
_out[0] = _sp[0];
_out[1] = _sp[1];
// Store value of best solution
_outVal = EvaluatePoints(_out[0], _out[1], _counter);
// Did one of the samples have a lower value?
bool improved = true;
// Repeat until no samples are better than current best solution
while(improved){
// Set false, only set true if one of the samples is better
improved = false;
// Generate samples
for(int i = 0; i < _p; i++){
double x = _out[0] + _z * (2 * (double)rand()/RAND_MAX - 1);
double y = _out[1] + _z * (2 * (double)rand()/RAND_MAX - 1);
// Enforce bounds
if(x < -512) {x = -512;}
if(x > 512) {x = 512;}
if(y < -512) {y = -512;}
if(y > 512) {y = 512;}
// Evaluate solution
double curVal = EvaluatePoints(x, y, _counter);
// Test samples for improvement
if(curVal < _outVal){
improved = true;
_out[0] = x;
_out[1] = y;
_outVal = curVal;
}
}
}
}
int main(int argc, char** argv){
// Read command line arguments
double sp[2] = {std::atof(argv[1]), std::atof(argv[2])};
int p = std::atoi(argv[3]);
double z = std::atof(argv[4]);
int seed = std::atoi(argv[5]);
// Set up output variables
double out[2];
double outVal;
int counter = 0;
// Do the thing
RHC(sp, p, z, seed, out, counter, outVal);
// Print output
std::cout << std::to_string(sp[0])
<< ", " + std::to_string(sp[1])
<< ", " + std::to_string(p)
<< ", " + std::to_string(z)
<< ", " + std::to_string(seed)
<< ", " + std::to_string(counter)
<< ", " + std::to_string(out[0])
<< ", " + std::to_string(out[1])
<< ", " + std::to_string(outVal)
<< "\n";
}