How to use parameter callback to parameterize mask workspace?

Question

Nicholas Hemenway 2024-3-8

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https://ww2.mathworks.cn/matlabcentral/answers/2092306-how-to-use-parameter-callback-to-parameterize-mask-workspace

编辑： Paul 2024-3-9

I am struggling to do what I thought would be super simple. I would like to parameterize a subsystem by using the mask work space.

As a super simple example, let's say I have a mask with a single input parameter -- frequency (f) in Hz. In the mask workspace, I would then like to have a derived variable for period -- T = 1/f that I can use throughout my blocks. T should then update anytime f is updated. Of course I could just directly plug in 1/f everywhere I would use T, but this isn't my design intent and doesn't always work when the expression for the derived variable is more complicated.

This seems like a perfect use case for parameter callbacks inside of a mask, but I cannot get it to work, and can't find any examples of anyone doing this online.

Here's my super simple subsystem:

Here's the mask setup with a single parameter:

And here's my attempt at creating a parameter callback:

What am I doing wrong and how do I accomplish this? I'm super surprised there isn't any examples of this in the documentation as parameterizeing a model like this seems like a fairly common use case.

Thanks,

Nick