How can I use a parameter as string in Matlab Function Block?

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Hello everyone,

I would like to use in a Matlab Block Function (in Simulink) an parameter (given in a mask). This parameter has to be a string (I use it in eval('base',my_string) ). My first thought was to NOT evaluate the parameter in the mask option but I still have this error

Do you know how I can use as it directly as a string? Hoping everything is clear despite my poor english,

Thanks in advance

"Expression 'names' for initial value of data 'names' (#164) must evaluate to a numeric or logical.

Right now, I bypass this issue by putting in the mask double('my_string') and then in the Matlab Function Block I do

char(my_string)

This is both ugly and boring since I have to type double('my_string') and note only my_string