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Program to implement the least square method

Posted By: Huberta Miller     Category: C Programming     Views: 10639

Program to implement the least square method.

Code for Program to implement the least square method in C Programming

#include<stdio.h>
#include "barrier.h"
#include "forkjoin.h"
#include "shared.h"int main()
{
 int n, i, pid, start, size, nproc, shmid1, shmid2, sh3, sh4, sh5, sh6, *y;
 int *x, *X, *XY, *X2, *Y, year;
        float a, b, data;

        printf("Enter the duration in years :: ");
        scanf("%d",&size);

        printf("Enter the starting year :: ");
        scanf("%d",&start);
        n=start;

        y=(int *)create_memory(size*2,&shmid1);
        x=(int *)create_memory(size*2, &shmid2);
        X=(int *)create_memory(size*2,&sh6);                         
        XY=(int *)create_memory(2,&sh3);
        X2=(int *)create_memory(2, &sh4);
        Y=(int *)create_memory(2,&sh5);

        *Y=*XY=*X2=0;
        for(i=0;i<size;i++)
        {
                x[i]=start;
                printf("Enter the data for year %d :: ",x[i]);
                scanf("%d",&y[i]);
                start++;
        }


        n=(int)(x[size-1]-x[0])/2;
        n=x[n];

        for(i=0;i<size;i++)
                X[i]=x[i]-n;


        printf("Enter the total number of processes :: ");
        scanf("%d",&nproc);                                  

        pid=create_process(&nproc);

        for(i=pid;i<size;i+=nproc)
        {
                *XY += X[i]*y[i];
                *X2 += (X[i])*(X[i]);
                *Y += y[i];
        }

        join_process(&nproc,&pid);

        a=(float)*XY/(*X2);
        b=(float)*Y/size;

        printf("The equation is y = %.2fx + %.2f",a,b);
        printf("\nEnter the year for which u want the data :: ");
        scanf("%d",&year);

        data=a*(year-n) + b;
        printf("\nFor year %d, the data value is %0.2f",year,data);

        cleanup_memory(&shmid1);             
        cleanup_memory(&shmid2);
        cleanup_memory(&sh3);
        cleanup_memory(&sh4);
        cleanup_memory(&sh5);
        cleanup_memory(&sh6);
        printf("\n");

        return 0;
}                             

/* OUTPUT */
Enter the duration in years :: 9 Enter the starting year :: 1995 Enter the data for year 1995 :: 10 Enter the data for year 1996 :: 11 Enter the data for year 1997 :: 12 Enter the data for year 1998 :: 13 Enter the data for year 1999 :: 17 Enter the data for year 2000 :: 14 Enter the data for year 2001 :: 15 Enter the data for year 2002 :: 18 Enter the data for year 2003 :: 17 Enter the total number of processes :: 5 The equation is y = 0.93x + 14.11 Enter the year for which u want the data :: 2004 For year 2004, the data valueis 18.78
  
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Huberta Miller
Huberta Miller author of Program to implement the least square method is from Frankfurt, Germany.
 
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