An enhancement request has been filed with the development team to improve the clarity of this error message for this scenario in Accelerator mode.
Question
I have a model open in accelerator mode. When I call 'set_param' to change the values of several model parameters, I get the following confusing error: >> set_param(vdp,'StopTime','100') Accelerator mode is not supported through the S-Function API Why is this? How can I fix this?
Expert Answer
Prashant Kumar
PhD Expert
Answered Aug 17, 2026
This error message is misleading, but there is a syntax error in the call to 'set_param' used here. The object input argument is supposed to be passed in as a string, character array, or handle to the object being modified.
In this case, passing in vdp (without quotes) is invalid because vdp is not evaluated correctly by set_param. Instead, pass in the name of the model in single quotes. The correct syntax is as follows:
>> set_param('vdp','StopTime','100')
If you change the model back to Normal mode then re-run the original command without quotes, the error message becomes more clear:
>> set_param(vdp,'StopTime','100') Warning: Non-scalar data in first argument to set_param is detected. Only first handle in the matrix is processed. Invalid Simulink object handle
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