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Filter Expressions

A  filter expression is a mathematical equation that returns a logical result, and is used to display a subset of network elements. The expression consists of a set of operators, functions and keywords. 

Some example filter expressions are as follows:

Centroids and Nodes

[Shows nodes with a node number > 200] i > 200 
[Shows nodes with User Data 1 <> 400] ui1 <> 400 

Links

[Shows links with assigned auto volume > 1000] volau > 1000 
[Shows links with a c mode] mode ~= 'c' 

Transit Lines and Segments

[Show only transit line 2] trim(lname) = '2' 
[Shows transit lines with a headway > 20] hdwy > 20 
[Shows transit segments with a dwell time factor > 0.1] dwt > 0.1 

Turns

[Shows turns that are not permitted] tpf=0
[Shows all turns that are permitted] tpf=255
[Shows turns with turn penalty = 1] tpf=1
[Shows turns with one node = 168] (inode=168) or (jnode=168) or (knode=168) 


Matrices Click here for more information.

[Shows cells with a value > 20] mv>20
[Shows cells where matrix mf1 cells > 20] mf1> 20
[Shows cells where the origin zone is in ensemble ga and group 1] ga(p) = 1