CGAL 6.1.1 - Polynomial

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PolynomialTraits_d::Degree Concept Reference
Reference Manual » Concepts

## Definition

This `AdaptableUnaryFunction` computes the degree of a `PolynomialTraits_d::Polynomial_d` with respect to a certain variable.

The degree of \( p\) with respect to a certain variable \( x_i\), is the highest power \( e\) of \( x_i\) such that the coefficient of \( x_i^{e}\) in \( p\) is not zero.

For instance the degree of \( p = x_0^2x_1^3+x_1^4\) with respect to \( x_1\) is \( 4\).

The degree of the zero polynomial is set to \( 0\). From the mathematical point of view this should be \( -infinity\), but this would imply an inconvenient return type.

Refines
  `AdaptableUnaryFunction`
  `CopyConstructible`
  `DefaultConstructible`

See also
  `Polynomial_d`
  `PolynomialTraits_d`
  `PolynomialTraits_d::TotalDegree`
  `PolynomialTraits_d::DegreeVector`

## Types
typedef int | result_type
typedef PolynomialTraits_d::Polynomial_d | argument_type

## Operations
result_type | operator() (argument_type p)
| Computes the degree of \( p\) with respect to the outermost variable \( x_{d-1}\).
result_type | operator() (argument_type p, int i)
| Computes the degree of \( p\) with respect to variable \( x_i\).

## Member Function Documentation

## ◆ operator()()

result_type PolynomialTraits_d::Degree::operator() | ( | argument_type | p,
|  | int | i
| ) |  |

Computes the degree of \( p\) with respect to variable \( x_i\).

Precondition
  \( 0 \leq i < d\).