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added coefficient

This commit is contained in:
Eric Berberich 2008-10-06 18:45:52 +00:00
parent 429b975186
commit d9fc6089e8
1 changed files with 31 additions and 0 deletions
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31
Polynomial/include/CGAL/Polynomial/polynomial_functions.h
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@ -171,7 +171,38 @@ substitute_xy(
return sub;
}
//! coefficient <I>a<SUB>ij</SUB></I> of <I>x<SUP>i</SUP>y<SUP>j</SUP></I>
template < class NT >
NT coefficient(const CGAL::Polynomial< CGAL::Polynomial< NT > > &p,
int i, int j) {
typedef CGAL::Polynomial_traits_d<
CGAL::Polynomial< CGAL::Polynomial< NT > > > PT_2;
CGAL_precondition(2 == PT_2::d);
typename PT_2::Get_innermost_coefficient coefficient;
CGAL::Exponent_vector ev;
ev.push_back(i);
ev.push_back(j);
return coefficient(p, ev);
}
//! coefficient <I>a<SUB>ijk</SUB></I> of <I>x<SUP>i</SUP>y<SUP>j</SUP><I>z<SUP>k</SUP></I>
template < class NT >
NT coefficient(
const CGAL::Polynomial < CGAL::Polynomial< CGAL::Polynomial< NT > > >
&p,
int i, int j, int k) {
typedef CGAL::Polynomial_traits_d<
CGAL::Polynomial< CGAL::Polynomial< CGAL::Polynomial< NT > > > > PT_3;
CGAL_precondition(3 == PT_3::d);
typename PT_3::Get_innermost_coefficient coefficient;
CGAL::Exponent_vector ev;
ev.push_back(i);
ev.push_back(j);
ev.push_back(k);
return coefficient(p, ev);
}
CGAL_END_NAMESPACE