Error for Gain block in Simulink

Hi there, I'm getting the following error when I try to type "1/(Ih+Ib)" into the parameter value of the Gain block in Simulink.

Both Ih and Ib are defined constants in the MATLAB workspace.

The error is: "Invalid setting in '.../Gain' for parameter 'Gain'."

Any advice on why this is not working. Seems like a simple thing that should not be a problem.

Thanks

[Dinesh Yadav]

Can you share your model or provide replication steps? I created a simple model using gain block and constants from workspace and the model works just fine. It would be easy to diagnose the problem by having a look at your model.

[AQILAH IZAM]

hi , i have the same problem , so how i want to solve it . thankyou

[Mathieu NOE]

hi

why not define directly in the workspace :

gain =1/(Ih+Ib) 

and use that "gain" in the simulink gain block parameter