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

From ApCoCoAWiki

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− | Computes the list of next-door neighbors in the border of the order ideal OO. The input is a list of terms | + | Computes the list of next-door neighbors in the border of the order ideal OO. The input is a list OO of terms that specify an order ideal. The output is a list of triples <formula>[i,j,k]</formula> such that <formula>b_i = x_k * b_j</formula>. |

<example> | <example> | ||

NDneighbors([1,x]); | NDneighbors([1,x]); |

## Revision as of 20:27, 7 November 2007

## borderbasis.NDneighbors

computes list of next-door neighbors

### Syntax

$borderbasis.NDneighbors(OO:LIST):LIST

### Description

Computes the list of next-door neighbors in the border of the order ideal OO. The input is a list OO of terms that specify an order ideal. The output is a list of triples <formula>[i,j,k]</formula> such that <formula>b_i = x_k * b_j</formula>.

#### Example

NDneighbors([1,x]); [[3, 1, 1], [4, 2, 1]] -------------------------------