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Vensim Help

To change the equation for a variable, select the "Equation(s)" tab in the editor.

equation_editor_tab_equations

Basic equation settings.

equation_editor_basic_settings

These settings allow you to change the basic equation type and set any subscript ranges that this variable uses.

Subscripts : This button allows you to add subscripts to a variable. Click here for more details on setting subscript ranges and editing multiple equations.

Equation type : This allows you to set the equation type. Choices are "Auxiliary", "Constant", "Data", "Initial", "Level", "Lookup", "Reality Check", "String" and "Time base". If you are unsure, use either "Auxiliary" or "Level".

Sub type : This allows you to set the equation sub-type. Choices are dependent on the Equation type selected.

Tools

There are a number of tools available for use when changing an equation.

eqed_button_check_syntax

Check the equation for any syntax errors.

equation_editor_icon_insertfunction

Insert a function

equation_editor_icon_causes

Insert one of the variables used to calculate this.

equation_editor_icon_lookup

Toggle between text and graph view of a lookup table.

equation_editor_icon_insert_variable

Add an existing variable to the equation that is not currently connected.

equation_editor_icon_change_font

Change the font in the editor.

Causes

equation_editor_causes

The causes list contains the list of variables that currently influence the equation. Click one of them to insert it into the equation.