undefined function or variable 'z' erro message

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 when I added a powergui block, this error messages keep appearing, i have used 'ctrl f' to find the variable 'z', but i did not find it.  Thank you!

Answer 1

[Christiaan]

Dear Runsheng,

If Simulink looks for the variable z and cannot find it, you could initialize this variable either from a constant block, the workspace, an m-file or direct in the initialization step of the model.

If you like to initialize z from the workspace, use the 'from workspace' block. Set the block parameter variable to z, and use i.e. the matlab prompt to define z.

If you like to initialize z at the start of the program, go to file->model properties->model properties->callbacks->InitFcn. Here you can type in z=1 (in Example)

If you like to initialize z at the start of the program, go to file->model properties->model properties->callbacks->InitFcn. Here you can type in initialise. If you now make an m-file which is called initialise.m where the value z is stored, you can initialise the simulink program over a mfile.

Good Luck, Christiaan