Numerical :Curve Fitting

 

Numerical :Curve Fitting

sample input

 

T	700	720	740	760
V	0.0977	0.12184	0.1406	0.15509

 

#include<stdio.h>

int main()

{

    float y[50],x[50],sumx=0,X,xx,sumxx=0,sumy=0,sumxy=0,xsum,ysum,a1,a0;

    int n;

printf("Enter the Range :");

scanf("%d",&n);

//....................................

printf("ENTER x =\n");

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

{

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

    sumx=sumx+x[i];

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

}

xsum=(sumx/n);

//....................................

printf("ENTER y =\n");

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

{

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

    sumy=sumy+y[i];

}

ysum=(sumy/n);

//.....................................

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

{

    sumxy=sumxy+x[i]*y[i];

}

//.....................................

a1=((n*sumxy)-(sumx*sumy))/((n*sumxx)-((sumx)*(sumx)));

printf("a1=%f",a1);

a0=((ysum)-(a1*xsum));

printf("\n\na0=%f",a0);

printf("\n NOw ENTER the value of X :");

printf("\nY=a0+a1X=");

scanf("%f",&X);

xx=a0+a1*X;

printf("\nANS= %f",xx);

return 0;

}