This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English verison of the page.

Note: This page has been translated by MathWorks. Please click here
To view all translated materals including this page, select Japan from the country navigator on the bottom of this page.


Array of rules in model object


The Rules property shows the rules in a Model object. Read-only array of SimBiology.Rule objects.

A rule is a mathematical expression that modifies a species amount or a parameter value. A rule defines how certain species and parameters should interact with one another. For example, a rule could state that the total number of species A and species B must be some value.

You can add a rule to a model object with the addrule method and remove the rule with the delete method. For more information on rules, see addrule and RuleType.


Applies toObject: model
Data typeArray of rule objects
Data valuesRule object


  1. Create a model object, and then add a reaction object.

    modelObj = sbiomodel ('my_model');
    reactionObj = addreaction (modelObj, 'a + b -> c + d');
  2. Add a rule.

    ruleobj = addrule(modelObj, '10-a+b')

    MATLAB® returns:

    SimBiology Rule Array
    Index:    RuleType:    Rule:
     1        algebraic    10-a+b

Was this topic helpful?