最小二乘法y=ae∧bx的c语言代码

下面是使用最小二乘法拟合指数函数y=a*e^(bx)的C语言代码示例：

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

#define MAXN 100

int main()
{
    int n, i;
    double x[MAXN], y[MAXN], sumx = 0, sumy = 0, sumxy = 0, sumx2 = 0;
    double b, a, e, S = 0;

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

    printf("Enter the data points:\n");
    for(i = 0; i < n; i++)
    {
        scanf("%lf %lf", &x[i], &y[i]);
        sumx += x[i];
        sumy += log(y[i]);
        sumxy += x[i] * log(y[i]);
        sumx2 += x[i] * x[i];
    }

    b = (n * sumxy - sumx * sumy) / (n * sumx2 - sumx * sumx);
    a = exp((sumy - b * sumx) / n);

    printf("The fitted exponential curve is: y = %lf * exp(%lf * x)\n", a, b);

    for(i = 0; i < n; i++)
    {
        e = y[i] - a * exp(b * x[i]);
        S += e * e;
    }

    printf("The sum of squared errors is: %lf\n", S);

    return 0;
}

该程序先输入数据点的数量和具体数值，然后计算出拟合指数函数y=a*e^(bx)的参数a和b，并输出拟合曲线的方程。最后计算误差平方和并输出结果。