//全区间上拉格朗日差值。书8(3)
#include<iostream>
using namespace std;
int main()
{
double a[6]={0.0,0.1,0.195,0.3,0.401,0.5};
double b[6]={0.39894,0.39695,0.39142,0.38138,0.36812,0.35206};
double c[3]={0.15,0.31,0.47};
double d[7];
double e[7];
double f[7];
int flag;
cout<<"全区间上拉格朗日插值:"<<endl;
double up=1,down=1,sum=0;
flag=5;
for(int n=0;n<3;n++)
{
if(c[n]<a[0]||c[n]>a[5])
{ cout<<"当x="<<c[n]<<"时,无法实现估算插值!"<<endl;}
else
{
int i,j;
for(i=0;i<=flag;i++)
{
for(j=0;j<=flag;j++)
{
d[j]=c[n]-a[j];
e[j]=a[i]-a[j];
}
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