C Program for Linear Regression

Program:-14

/*Linear Regression*/

#include<stdio.h>

#include<conio.h>

#include<alloc.h>

void main()

{

float *x,*y,n,i,x1=0,x12=0,y1=0,x1y1=0,a1,a0,e;

puts("-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*");

printf("How many values You are Entering");

scanf("%f",&n);

puts("-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*");

x=(float*)malloc(n*4);

y=(float*)malloc(n*4);

puts("-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*");

puts("Enter coressponding Elements X & Y");

for(i=0;i<n;i++)

{

scanf("%f %f",&x[i],&y[i]);

x1+=x[i];

y1+=y[i];

x1y1+=(x[i]*y[i]);

x12+=(x[i]*x[i]);

}

a1=(n*x1y1-x1*y1)/(n*x12-x1*x1);

a0=y1/n-a1*x1/n;

e=y[0]-a0-a1*x[0];

a0+=e;

puts("-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*");

printf("\nY=%f+%fX",a0,a1);

puts("-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*");

}
















Output of Program:-

-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-

How many values You are Entering7

-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-

Enter coressponding Elements X & Y

1 0.5

2 2.5

3 2

4 4

5 3.5

6 6

7 5.8

-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-

Y=-0.371429+0.871429X

-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-