C Program for Polynomial Regression

Program:-15

/* Polynmial Regresion */

#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;

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

scanf("%f",&n);

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

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

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];

printf("ao=%f\na1=%f\ne%f",a0,a1,e);

}























































Output of Program:-

How many values You are Entering

6

Enter coressponding Elements X & Y

0 2.1

1 7.7

2 13.6

3 27.2

4 40.4

5 61.1

Matrix

6.000000 15.000000 55.000000 152.100006

15.000000 55.000000 225.000000 583.599976

55.000000 225.000000 979.000000 2480.800049

Required Equation

Y=4.632166+2.271759X+1.869648X2