Difference between revisions of "ApCoCoA-1:BB.CoeffOfBB"

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<command>
 
<command>
 
   <title>BB.CoeffOfBB</title>
 
   <title>BB.CoeffOfBB</title>
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     <type>coefficient</type>
 
     <type>coefficient</type>
 
   </types>
 
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   <see>BB.BBscheme</see>
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   <see>ApCoCoA-1:BB.BBscheme|BB.BBscheme</see>
   <see>BB.HomBBscheme</see>
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   <see>ApCoCoA-1:BB.HomBBscheme|BB.HomBBscheme</see>
 
   <key>CoeffOfBB</key>
 
   <key>CoeffOfBB</key>
 
   <key>BB.CoeffOfBB</key>
 
   <key>BB.CoeffOfBB</key>
 
   <key>borderbasis.CoeffOfBB</key>
 
   <key>borderbasis.CoeffOfBB</key>
   <wiki-category>Package_borderbasis</wiki-category>
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   <wiki-category>ApCoCoA-1:Package_borderbasis</wiki-category>
 
</command>
 
</command>

Latest revision as of 09:40, 7 October 2020

This article is about a function from ApCoCoA-1.

BB.CoeffOfBB

Computes the coefficient matrix of a border basis.

Syntax

BB.CoeffOfBB(BB:LIST,OO:LIST):MAT

Description

Computes the coefficient matrix of the OO-border basis BB of the ideal generated by the polynomials of BB. The output is a matrix.

  • @param BB A list of terms representing the OO-border basis of the ideal generated by the polynomials of BB.

  • @param OO A list of terms representing an order ideal.

  • @return The coefficient matrix.

Example

Use QQ[x,y];

BB.CoeffOfBB([xy^2, x^3 + xy, y^4, xy^3, x^2y^2, x^3y],
             [1, y, y^2, y^3, x, xy, x^2, x^2y]);

-------------------------------
Mat([
  [0, 0, 0, 0, 0, 0],
  [0, 0, 0, 0, 0, 0],
  [0, 0, 0, 0, 0, 0],
  [0, 0, 0, 0, 0, 0],
  [0, 0, 0, 0, 0, 0],
  [0, 1, 0, 0, 0, 0],
  [0, 0, 0, 0, 0, 0],
  [0, 0, 0, 0, 0, 0]
])
-------------------------------

BB.BBscheme

BB.HomBBscheme