Main Content

addparameter (model, kineticlaw)

Create parameter object and add to model or kinetic law object

Syntax

parameterObj = addparameter(Obj, 'NameValue')
parameterObj = addparameter(Obj, 'NameValue', ValueValue)
parameterObj = addparameter(...'PropertyName', PropertyValue...)

Arguments

ObjModel object or kineticlaw object. Enter a variable name for the object.
NameValueProperty for a parameter object. Enter a unique character vector.

Since objects can use this property to reference a parameter, a parameter object must have a unique name at the level it is created. For example, a kinetic law object cannot contain two parameter objects named kappa. However, the model object that contains the kinetic law object can contain a parameter object named kappa along with the kinetic law object.

For information on naming parameters, see Name.

ValueValueProperty for a parameter object. Enter a number.

Description

parameterObj = addparameter(Obj, 'NameValue') creates a parameter object and returns the object (parameterObj). In the parameter object, this method assigns a value (NameValue) to the property Name, assigns a value 1 to the property Value, and assigns the model or kinetic law object to the property Parent. In the model or kinetic law object, (Obj), this method assigns the parameter object to the property Parameters.

A parameter object defines an assignment that a model or a kinetic law can use. The scope of the parameter is defined by the parameter parent. If a parameter is defined with a kinetic law object, then only the kinetic law object and objects within the kinetic law object can use the parameter. If a parameter object is defined with a model object as its parent, then all objects within the model (including all rules, events and kinetic laws) can use the parameter.

modelObj = sbiomodel('cell')
parameterObj = addparameter(modelObj, 'TF1', 0.01)


modelObj = sbiomodel('cell')
reactionObj = addreaction(modelObj, 'a -> b')
kineticlawObj = addkineticlaw (reactionObj, 'MassAction')
parameterObj = addparameter(kineticlawObj, 'K1_forward', 0.1)

parameterObj = addparameter(Obj, 'NameValue', ValueValue) creates a parameter object, assigns a value (NameValue) to the property Name, assigns the value (ValueValue) to the property Value, and assigns the model object or the kineticlaw object to the property Parent. In the model or kinetic law object (Obj), this method assigns the parameter object to the property Parameters, and returns the parameter object to a variable (parameterObj).

parameterObj = addparameter(...'PropertyName', PropertyValue...) defines optional property values. The name-value pairs can be in any format supported by the function set.

Scope of a parameter — A parameter can be scoped to either a model or a kinetic law.

  • When a kinetic law searches for a parameter in its expression, it first looks in the parameter list of the kinetic law. If the parameter isn’t found there, it moves to the model that the kinetic law object is in and looks in the model parameter list. If the parameter isn’t found there, it moves to the model parent.

  • When a rule searches for a parameter in its expression, it looks in the parameter list for the model. If the parameter isn’t found there, it moves to the model parent. A rule cannot use a parameter that is scoped to a kinetic law. So for a parameter to be used in both a reaction rate equation and a rule, the parameter should be scoped to a model.

Additional parameter object properties can be viewed with the get command. Additional parameter object properties can be modified with the set command. The parameters of Obj can be viewed with get(Obj, 'Parameters').

A SimBiology® parameter object can be copied to a SimBiology model or kinetic law object with copyobj. A SimBiology parameter object can be removed from a SimBiology model or kinetic law object with delete.

Method Summary

Methods for parameter objects

copyobjCopy SimBiology object and its children
deleteDelete SimBiology object
displayDisplay summary of SimBiology object
findUsagesFind out how a species, parameter, or compartment is used in a model
getGet SimBiology object properties
moveMove SimBiology species or parameter object to new parent
renameRename object and update expressions
setSet SimBiology object properties

Property Summary

Properties for parameter objects

Constant Specify variable or constant species amount, parameter value, or compartment capacity
ConstantValueSpecify variable or constant parameter value
NameSpecify name of object
NotesHTML text describing SimBiology object
ParentIndicate parent object
TagSpecify label for SimBiology object
TypeDisplay SimBiology object type
Units Units for species amount, parameter value, compartment capacity, observable expression
UserDataSpecify data to associate with object
ValueValue of species, compartment, or parameter object
ValueUnitsParameter value units

Example

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

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

  2. Define a kinetic law for the reaction object.

    kineticlawObj = addkineticlaw(reactionObj, 'MassAction');

  3. Add a parameter and assign it to the kinetic law object (kineticlawObj); add another parameter and assign to the model object (modelObj).

    % Add parameter to kinetic law object
parameterObj1 = addparameter (kineticlawObj, 'K1');

get (kineticlawObj, 'Parameters')

    MATLAB returns: 

    SimBiology Parameter Array

Index:    Name:    Value:    ValueUnits:
 1         K1       1             

    % Add parameter with value 0.9 to model object
parameterObj1 = addparameter (modelObj, 'K2', 0.9);

get (modelObj, 'Parameters')
    MATLAB returns: 
    SimBiology Parameter Array

 Index:    Name:    Value:    ValueUnits:
   1         K2       1

Version History

Introduced in R2006a

expand all

See Also

| |