Description

Component parameters let you specify adjustable parameters for the Simscape™ block generated from the component file. Parameters will appear in the block dialog box and can be modified when building and simulating a model.

parameters begins a component parameters definition block, which is terminated by an end keyword. This block contains declarations for component parameters. Parameters will appear in the block dialog box when the component file is brought into a Simscape model. Each parameter is defined as a value with unit. Specifying an optional comment lets you control the parameter name in the block dialog box.

The following syntax defines a component parameter, comp_par1, as a value with unit. value is the initial value. unit is a valid unit string, defined in the unit registry.

parameters
    comp_par1 = { value , 'unit' };
end

To declare a unitless parameter, you can either use the same syntax:

 par1 = { value , '1' };

or omit the unit and use this syntax:

 par1 = value;

Internally, however, this parameter will be treated as a two-member value-unit array { value , '1' }.

You can specify the parameter name, the way you want it to appear in the block dialog box, as a comment:

parameters
    comp_par1 = { value , 'unit' }; % Parameter name
end

Examples

The following example declares parameter k, with a default value of 10 N*m/rad, specifying the spring rate of a rotational spring. In the block dialog box, this parameter will be named Spring rate.

parameters
    k = { 10 'N*m/rad' };   % Spring rate
end

See Also

variables