link.gabriel Function (GPL)

Syntax

link.gabriel(<algebra>)

or 

link.gabriel(<binning function>)

or 

link.gabriel(<statistic function>)

<algebra>. Graph algebra, such as x*y. Refer to Brief Overview of GPL Algebra for an introduction to graph algebra.

<binning function>. A binning function.

<statistic function>. Another statistic function. The result of the embedded statistic is used to calculate link.gabriel.

Description

Calculates the Gabriel graph for the values. This function is typically used with the edge graphic element. A Gabriel graph connects values if they are Gabriel neighbors. Gabriel neighbors are defined by imagining a circle whose diameter is the line connecting two values. The values are Gabriel neighbors if the circle doesn't contain any other values.

Examples

Figure 1. Example: Creating a Gabriel graph
ELEMENT: edge(position(link.gabriel(x*y)))

Statistic Functions

See GPL Functions .