IRIS Toolbox Reference Manual

!exogenous_variables

List of exogenous variables

Syntax

!exogenous_variables
    VariableName, VariableName, ...
    ...

Syntax with descriptors

!exogenous_variables
    VariableName, VariableName, ...
    'Description of the variable...' VariableName

Syntax with steady-state values

!exogenous_variables
    VariableName, VariableName, ...
    VariableName = Value

Description

The !exogenous_variables keyword starts a new declaration block for exogenous variables, i.e. variables that can appear only in !dtrends equations. The names of the variables must be separated by commas, semi-colons, or line breaks. You can have as many declaration blocks as you wish in any order in your model file: They all get combined together when you read the model file in. Each variable must be declared (exactly once).

You can add descriptors to the variables (enclosed in single or double quotes, preceding the name of the variable); these will be stored in, and accessible from, the model object. You can also assign steady-state values to the variables straight in the model file (following an equal sign after the name of the variable); this is, though, rather rare and unnecessary practice because you can assign and change steady-state values more conveniently in the model object.

Example

!exogenous_variables
    X, 'Tax effects' Y
    'Population growth effects' Z = 0 + 0.5i;