How to disallow string in block mask parameters?

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Soham Sinha 2021-12-13

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https://ww2.mathworks.cn/matlabcentral/answers/1610235-how-to-disallow-string-in-block-mask-parameters

回答： Sanman 2022-1-27

How can I apply a constraint to a block mask parameter so that when a string is entered in the dialog block mask parameter, it is shown as an error? I could not find any option in Mask Parameter -> Constraint.

Also, how can I get the "evaluated" value of the block mask parameters in Initialization Commands? I am entering `b = get_param(block_handle, 'myparam1'), but getting a string for it. I want to get a double value and then compare to some value to show some error message.

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Answer 1

Sanman 2022-1-27

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https://ww2.mathworks.cn/matlabcentral/answers/1610235-how-to-disallow-string-in-block-mask-parameters#answer_882820

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Hi Soham,

Using mask parameter constraints, you can set the datatype you want for the mask parameter. I hope the following documentation can help you with that.

https://www.mathworks.com/help/simulink/ug/mask-parameter-constraints.html

For your second question, you just need to use the function "eval" to do that.

b = eval(get_param(block_handle, 'myparam1'))

You can find the documentation for the function here - https://www.mathworks.com/help/matlab/ref/eval.html