CGAL 6.2 - Polynomial

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PolynomialTraits_d::PolynomialSubresultantsWithCofactors Concept Reference
Reference Manual » Concepts

## Definition

Computes the polynomial subresultant of two polynomials \( p\) and \( q\) of degree \( n\) and \( m\), respectively, as defined in the documentation of `PolynomialTraits_d::PolynomialSubresultants`. Moreover, for \( \mathrm{Sres}_i(p,q)\), polynomials \( u_i\) and \( v_i\) with \( \deg u_i\leq m-i-1\) and \( \deg v_i\leq n-i-1\) are computed such that \( \mathrm{Sres}_i(p,q)=u_i p + v_i q\). \( u_i\) and \( v_i\) are called the cofactors of \( \mathrm{Sres}_i(p,q)\).

The result is written in three output ranges, each of length \( \min\{n,m\}+1\), starting with the \( 0\)-th subresultant and the corresponding cofactors.

Note
  This functor is optional.

Refines
  `AdaptableBinaryFunction`
  `CopyConstructible`
  `DefaultConstructible`

See also
  `Polynomial_d`
  `PolynomialTraits_d`
  `PolynomialTraits_d::Resultant`
  `PolynomialTraits_d::PolynomialSubresultants`
  `PolynomialTraits_d::PrincipalSubresultants`
  `PolynomialTraits_d::SturmHabichtSequenceWithCofactors`

## Operations
template<typename OutputIterator1 , typename OutputIterator2 , typename OutputIterator3 >
OutputIterator1 | operator() (Polynomial_d p, Polynomial_d q, OutputIterator1 sres, OutputIterator2 co_p, OutputIterator3 co_q)
| computes the subresultants of \( p\) and \( q\), and the cofactors, with respect to the outermost variable.
template<typename OutputIterator1 , typename OutputIterator2 , typename OutputIterator3 >
OutputIterator1 | operator() (Polynomial_d p, Polynomial_d q, OutputIterator1 sres, OutputIterator2 co_p, OutputIterator3 co_q, int i)
| computes the subresultants of \( p\) and \( q\), and the cofactors, with respect to \( x_i\).

## Member Function Documentation

## ◆ operator()() [1/2]

template<typename OutputIterator1 , typename OutputIterator2 , typename OutputIterator3 >

OutputIterator1 PolynomialTraits_d::PolynomialSubresultantsWithCofactors::operator() | ( | Polynomial_d | p,
|  | Polynomial_d | q,
|  | OutputIterator1 | sres,
|  | OutputIterator2 | co_p,
|  | OutputIterator3 | co_q
| ) |  |

computes the subresultants of \( p\) and \( q\), and the cofactors, with respect to the outermost variable.

Each element is of type `PolynomialTraits_d::Polynomial_d`.

## ◆ operator()() [2/2]

template<typename OutputIterator1 , typename OutputIterator2 , typename OutputIterator3 >

OutputIterator1 PolynomialTraits_d::PolynomialSubresultantsWithCofactors::operator() | ( | Polynomial_d | p,
|  | Polynomial_d | q,
|  | OutputIterator1 | sres,
|  | OutputIterator2 | co_p,
|  | OutputIterator3 | co_q,
|  | int | i
| ) |  |

computes the subresultants of \( p\) and \( q\), and the cofactors, with respect to \( x_i\).

Each element is of type `PolynomialTraits_d::Polynomial_d`.