utility.h
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	/*
	============================================================================
	Filename : utility.h
	Author : Arash Pourhabibi
	============================================================================
	*/
	#ifndef UTILITYH
	#define UTILITYH

	struct timeval start, finish_time;

	void set_clock()
	{
	gettimeofday(&start, NULL);
	}

	double elapsed_time()
	{
	gettimeofday(&finish_time, NULL);
	double elapsed = (finish_time.tv_sec - start.tv_sec);
	elapsed += (double)(finish_time.tv_usec - start.tv_usec) / 1000000.0;
	return elapsed;
	}

	//Initialize the two-dimensional array
	void init(double *x, int length)
	{
	memset(x, 0, sizeof(double)lengthlength);
	x[(length/2-1)*length+(length/2-1)] = 1000;
	x[(length/2)*length+(length/2-1)] = 1000;
	x[(length/2-1)*length+(length/2)] = 1000;
	x[(length/2)*length+(length/2)] = 1000;
	}

	//Save the two-dimensional array in a csv file
	void save(double *x, int length)
	{
	ofstream output_file;
	output_file.open("outputmatrix.csv");
	for(int i=0; i<length; i++)
	{
	for(int j=0; j<length-1; j++)
	output_file<<setprecision(4)<<x[i*length+j]<<";";
	output_file<<setprecision(4)<<x[i*length+length-1]<<";"<<endl;
	}
	output_file.close();
	}

	#endif