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

			#include <time.h>
			#include <sys/time.h>
			#include <string.h>

			#define INIT_VALUE 1000
			#define x(i,j) x[(i)*length+(j)]

			struct timeval start, end;

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

			double elapsed_time()
			{
			gettimeofday(&end, NULL);
			double elapsed = (end.tv_sec - start.tv_sec);
			elapsed += (double)(end.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/2-1) = INIT_VALUE;
			x(length/2-1,length/2) = INIT_VALUE;
			x(length/2,length/2-1) = INIT_VALUE;
			x(length/2,length/2) = INIT_VALUE;
			}

			//Save the two-dimensional array in a csv file
			void save(double x, int length, const char outputfilename)
			{
			FILE *output_file;
			output_file = fopen(outputfilename,"w");
			for(int i=0; i<length; i++)
			{
			for(int j=0; j<length-1; j++)
			fprintf(output_file, "%.4g;", x(i,j));
			fprintf(output_file, "%.4g", x(i,length-1));
			fprintf(output_file, "\n");
			}
			fclose(output_file);
			}

			#endif