ASD08_Approx

// ASD08_Approx.cpp: определяет точку входа для консольного приложения.
//

#include "stdafx.h"
#include <iostream>
using namespace std;

double sum(double X[10])
{
	double s = 0;
	for(int i = 0; i < 10; i++)
	{
		s += X[i];
	}
	return s;
}

double sumXY(double X[10], double Y[10])
{
	double s = 0;
	for(int i = 0; i < 10; i++)
	{
		s += X[i] * Y[i];
	}
	return s;
}

double A1(double X[10], double Y[10], int n)
{
	return	(sum(Y) * sum(X) - n*sumXY(X, Y))/
			(sum(X) * sum(X) - n*sumXY(X, X));
}

double A0(double X[10], double Y[10], int n)
{
	return (sum(Y) - A1(X, Y, n) * sum(X)/n);
}

double f(double x, double X[10], double Y[10], int n)
{
	return A0(X, Y, n) + A1(X, Y, n)*x; // Линейный многочлен
}

int _tmain(int argc, _TCHAR* argv[])
{
	double X[10] = {0, 5, 8, 9, 10, 15, 18, 20, 21, 23};
	double Y[10] = {4, 10, 5, -8, 7, 15, 24, 30, 21, 20};
	int n = 10;
	double x = 1.6;

	double result = f(x, X, Y, n);
	cout << result << endl;

	system("PAUSE");
	return 0;
}