z关于x和y的二元最小二乘C语言代码

以下是关于x和y的二元最小二乘的C语言代码：

#include <stdio.h>
#include <math.h>

#define MAX 100

int main()
{
    int n, i;
    double sum_x = 0, sum_y = 0, sum_x2 = 0, sum_xy = 0, a, b, x[MAX], y[MAX];

    printf("Enter the number of data points: ");
    scanf("%d", &n);

    printf("Enter the data points:\n");
    for(i = 0; i < n; i++)
    {
        printf("x[%d] = ", i);
        scanf("%lf", &x[i]);

        printf("y[%d] = ", i);
        scanf("%lf", &y[i]);

        sum_x += x[i];
        sum_y += y[i];
        sum_x2 += pow(x[i], 2);
        sum_xy += x[i] * y[i];
    }

    b = (n * sum_xy - sum_x * sum_y) / (n * sum_x2 - pow(sum_x, 2));
    a = (sum_y - b * sum_x) / n;

    printf("\nThe equation of the line is: y = %.2lfx + %.2lf", b, a);

    return 0;
}

其中，x和y分别存储了n个数据点，a和b分别代表直线方程中的截距和斜率。程序通过输入数据点来计算出a和b，最终输出直线方程。