?? qsimp.cpp
字號:
void qsimp(double a, double b, double& s)
{
double eps = 0.000001;
const int jmax = 20;
double ost = -1e+30;
double st, os = -1e+30;
for (int j = 1; j<=jmax; j++)
{
trapzd(a, b, st, j);
s = (4.0 * st - ost) / 3.0;
if (fabs(s - os) < eps * fabs(os))
{
return;
}
os = s;
ost = st;
}
cout<<"too many steps."<<endl;
}
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