?? d14r8.cpp
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#include<math.h>
#include<iomanip.h>
#include<iostream.h>
#include<process.h>
void main()
{
//program d14r8
//driver for routine pzextr
//feed values from a rational function
//fn(x)=(1-x+x**3)/(x+1)**n
int nv,nuse,i,j,iest;
double xest,dum;
nv = 4;
nuse = 5;
double yest[5], yz[5], dy[5];
for (i = 1; i<=10; i++)
{
iest = i;
xest = 1.0 / float(i);
dum = 1.0 - xest + pow(xest , 3);
for (j = 1; j<= nv; j++)
{
dum = dum / (xest + 1.0);
yest[j] = dum;
}
pzextr(iest, xest, yest, yz, dy, nv, nuse);
cout<<endl;
cout<<"I= "<< i<<endl;
cout<<"Extrap. function: ";
cout<<setprecision(6)<<setiosflags(ios::fixed);
for (j = 1; j<= nv; j++)
{
cout<<setw(13)<<yz[j];
}
cout<<endl;
cout<<"Estimated error: ";
for (j = 1; j<= nv; j++)
{
cout<<setw(13)<<dy[j];
}
cout<<endl;
}
cout<<endl;
cout<<"actual values: "<<setw(13)<<"1.000000";
cout<<setw(13)<<"1.000000"<<setw(13)<<"1.000000";
cout<<setw(13)<<"1.000000"<<endl;
}
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