EXPONENCIAL CURVE FITTING

#include "stdio.h"
#include "conio.h"
#include "math.h"
 
void main ()
{
    int n,i;
    float a,la,b,x[50],y[50],lx[50],ly[50],lx2[50],m[50];
    float elx = 0,ely = 0,elx2 = 0,em = 0;
    clrscr ();
    printf ("Exponential Curve Fitting:\n\n");
    printf ("\n-------------------------------------\n\n\n");
    printf ("Enter the number of values do you give : ");
    scanf ("%d",&n);
    clrscr ();
    for (i=0; i
    {
        printf ("Enter X%d: ",i);
        scanf ("%f",&x[i]);
        printf ("Enter Y%d: ",i);
        scanf ("%f",&y[i]);
        printf ("\n");
    }
    for (i=0; i
    {
        lx[i]  = logl (x[i]);
        ly[i]  = logl (y[i]);
        lx2[i] = lx[i] * lx[i];
        m[i]   = lx[i] * ly[i];
    }
    for (i=0; i
    {
        elx  += lx[i];
        ely  += ly[i];
        elx2 += lx2[i];
        em   += m[i];
    }
    b  = ((n * em) - (elx * ely)) / ((n * elx2) - (elx * elx));
    la = (ely - (b * elx)) / n;
    a  = exp (la);
    clrscr ();
    printf ("\nXi          Yi          ln(Xi)      ln(Yi)\tln(Xi)2     ln(Xi)ln(Yi)\n\n");
    for (i=0; i
    {
        printf ("%f    ",x[i]);
        printf ("%f    ",y[i]);
        printf ("%f    ",lx[i]);
        printf ("%f    ",ly[i]);
        printf ("%f    ",lx2[i]);
        printf ("%f\n",m[i]);
        printf ("\n");
    }
    printf ("\n-------------------------------------");
    printf ("\n\n\na = %f",a);
    printf ("\n\nb = %f",b);
getch ();
}


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