Arc

Arc

To associate a Dictionary for Arc properties, select

Main Menu > Data > Associate Dictionary > Arc >

and then select the property from the submenu:

• Arcs

  • Specifies the addition or removal of arcs for the currently active Bayesian network. If an arc removal is specified, it will precede any addition of an arc.

  • Before adding arcs, any constraints applicable to the active Bayesian network and the Temporal Indices will be checked. If a specified arc addition is inconsistent with the existing constraint, the arc won't be added.

  • Syntax Examples:

    • N1->N2=true adds an arc from N1 to N2

    • N1->N2=false removes the arc from N1 to N2

    • N1<-N2=true adds an arc from N2 to N1 (note the reversal of the arrow symbol <- produces an arc in the opposite direction).

    • Note that you need to add an escape character \ before any spaces in node names. Otherwise, a space will be interpreted as a delimiter: N\ 1->Node\ 2=true adds an arc from N 1 to N 2

    • Instead of the -> characters, you can also use space , the equal sign = , and -- as a delimiter between the start node and end node. With these alternative delimiters, the order of the nodes determines the arc direction.

    • N1 N2=true adds an arc from N1 to N1

    • N1=N2=true adds an arc from N1 to N2

    • N1--N2=true adds an arc from N1 to N2

    • N1 N2=true adds an arc from N1 to N2

• Forbidden Arcs

  • Specifies the addition or removal of Forbidden Arcs between nodes and classes

  • Syntax Examples:

    • N1->N2 adds a Forbidden Arc from N1 to N2

    • N1--N2 adds a Forbidden Arc between N1 and N2

    • ClassA->ClassB applies Forbidden Arcs from any nodes in ClassA to any nodes in ClassB

    • N1 N2 removes any existing Forbidden Arc between N1 and N2. Note the space in the syntax, which triggers the removal of the Forbidden Arc.

• Arc Comments

  • Adds, updates, or removes Arc Comments to arcs in the active network. Arc Comments are stored in HTML format.

  • Syntax Examples:

    • N1->N2=<p>This is a sample <b>Arc Comment</b>.</p> adds an Arc Comment to the arc between N1 and N2.

    • N1->N2= removes an existing Arc Comment from the arc between N1 and N2.

    • The added Arc Comment can be edited in the Arc Editor: Arc Contextual Menu > Edit

• Arc Colors

  • Defines colors for arcs in the active network. You can specify the color for each arc individually by providing the hex code of the color

  • Syntax Examples:

    • N1->N2=000000 changes the color of the arc between N1 and N2 to black.

    • N1->N2=FF0000 changes the color of the arc between N1 and N2 to bright red.

    • Note that there is no option to revert an arc color to the default color. When changing Arc Colors via a Dictionary, the colors must always be specified explicitly.

• Structural Priors

  • Assigns Structural Priors to arcs in the active network.

• Fixed Arcs

  • Applies Fixed Arcs to the active network or removes them.

  • Syntax Example:

    • N1->N2=true changes the arc between N1 and N2 to a Fixed Arc.

    • N1->N2=false changes the arc between N1 and N2 to a normal, non-fixed arc.