utility.h
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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