Why am I unable to change the default value of a block parameter using the SET_PARAM function in Simulink 5.1 (R13SP1)?

The documentation for the SET_PARAM function is accessed by typing the following at the MATLAB prompt:

doc set_param

This documentation includes the following:

 set_param('obj', 'parameter1', value1, 'parameter2', value2, ...), where 'obj' is a system or block path or 0, sets the specified parameters to the specified values. Use 0 to set the default value of a parameter or the values of session parameters.

However, I am unable to set the default value of a Simulink block parameter. For example, the following command fails to set the default value of the 'Amplitude' parameter in the Sine Wave block as 5 (instead of 1):

set_param(0, 'Amplitude', '5')

Answer 1

[MathWorks Support Team]

The documentation in Release 2009a (R2009a) has been updated in this regard.

Previous releases of the product documentation in the SET_PARAM section erroneously state that 0 can be used to set the default value of a parameter.

The default value of a Simulink block parameter cannot be changed using the SET_PARAM command. To work around this issue, create a custom library that contains blocks for which you have set the parameter values accordingly.