# Difference between revisions of "ApCoCoA-1:BB.GenHomMultMat"

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<title>BB.GenHomMultMat</title> | <title>BB.GenHomMultMat</title> |

## Latest revision as of 09:40, 7 October 2020

This article is about a function from ApCoCoA-1. |

## BB.GenHomMultMat

Computes a generic homogeneous multiplication matrix.

### Syntax

BB.GenHomMultMat(I:INT,OO:LIST):MAT

### Description

Computes the generic homogeneous multiplication matrix for `x[I]` with respect to an order ideal. The inputs are an integer `I` and a list `OO` of terms that specify an order ideal. The second element of `OO` must be a non-constant polynomial. The output is a matrix of size Len(OO) x Len(OO) over the ring `BBS=K[c_{ij}]`.

@param

*I*An integer which specifies the indeterminate for which the generic homogeneous multiplication matrix will be computed.@param

*OO*A list of terms representing an order ideal.@return The generic homogeneous multiplication matrix.

#### Example

Use QQ[x, y, z], DegRevLex; BB.GenHomMultMat(1, [1, x, x^2, y, z]); ------------------------------- Mat([ [0, 0, 0, 0, 0], [1, 0, 0, 0, 0], [0, 1, 0, BBS :: c[3,5], BBS :: c[3,3]], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0] ]) -------------------------------