拉格朗日插值,拉格朗日（Lagrange）插值算法程序
//n次拉格朗日插值 #include
#include double lagrange(double *x, double *y, double x0, int n) { int i, j; double Ln = 0, l; for (i = 0; i <= n; i++) { l = 1.0; for (j = 0; j <= n; j++) { if (i == j) { continue; } l = l * (x0 - x[j]) /(x[i] - x[j]); } Ln = Ln + y[i] * l; } return Ln; } int main() { double *x, *y; double x0, Ln; int i, n; printf("请输入多项式次数：\n"); scanf("%d", &n); x = (double*)malloc((siz
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