Variable Dependency Graph

Builds a directed network from a variable-definition table. Each edge means that one variable expression references another variable.

Inputs

Signal	Type	Description
Variable Definitions	Orange.data.Table	Table with Variable and Expression columns, usually produced by Time Features Constructor.

Outputs

Signal	Type	Description
Network	orangecontrib.network.Network	Directed dependency graph.

How It Works

Rows without an expression are treated as original variables. Rows with an expression are treated as derived variables. The widget scans each expression for references to known variable names and creates one directed edge per dependency.

The output network stores node metadata:

Meta Variable	Description
var_name	Variable name.
var_type	Derived for generated variables or Original for source variables.

Controls

Generate rebuilds the graph from the current configuration table. The widget also generates automatically when valid input arrives.

Input Requirements

The input table must contain the first two columns named exactly Variable and Expression. If these columns are missing or renamed, the widget reports an error and sends no network.