The Dialog Callback is tricky because you can’t always guarantee that the value is known. For example, when I set a gain value of A, I often later add that to the model workspace, or base workspace. The tricky problem you face is trying to anticipate where the variable is coming from, and as you note, it could be in the model workspace, the MATLAB base workspace, or some parent system workspace that passed down through hierarchical resolution.

An alternative design is to use Mask Initialization to check the value. At that point, the value is known and available to your code without calling get_param.

Can you give more details about what you are trying to do in yor mask callback?

@Jim - The two methods can be combined. If you have large structural changes in your block algorithm, the configurable subsystem can be used to switch between them. It may be even easier to simply delete one block and replace it with the other, and then wire the ports appropriately.

Can the two techniques be combined - i.e., can I update my configurable subsytems to remove unused inputs via self-modification without breaking all my existing models that use those blocks?

I took your advice, and the advice of a commenter to create an “enumeration” of parameter indices. Now my callback switchyard calls get_param(blk, ‘MaskNames’) and passes that result to the individual handlers. Using the global enumerated indices, I don’t change any code if I rename parameters. I just have to keep the enumerations up to date.

One question. If my parameter is set to a variable, get_param() in my callbacks returns that variable string. I’ve found that I have to try evaluating the get_param() results in first the model workspace, and then the caller (i.e. MATLAB’s) workspace if I need the actual numeric value. Is this indeed the case? Is their an easier way?

Thanks again.
reilly.

Great graphics you got here. I especially like the first one, cool animated picture! I”m not a big simulink user, but I like the way you presented your information. Love the graphics.

Quan

For example, I would like to have a popup, whichs offers the choice between different parameter files I can load for the block. Now, I don’t want to alter the popup manually everytime I add a parameter-file to the list in the library block but rather scan a folder containing the files and create the popup list accordingly. Whenever I try something like this in the dialog callback with
set_param(blk,’MaskStyles’,list)
the dialog is closed automatically with a warning that a mask parameter has been changed.

Any suggestions/ideas on how to solve this problem?

Thanks

As far as I can gather, it is not possible to stream data created using signal logging of a virtual bus to an Input port of another model. Could you comment on this?

I would like to avoid the non-virtual bus stuff since it sounds too much hassle for a medium sized project and I want to keep my diagrams clean (i.e. just press play)