How do I set numerical values to options in a dropdown menu made on appdesigner? I will have multiple drop down menus, the the options in each drop down will need their values added together and display the result.

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Jonathan Patten
Jonathan Patten 2018 年 11 月 30 日
回答済み: Waleed Sahhary 2021 年 11 月 21 日
  1 件のコメント
Greg 2018 年 12 月 1 日
Can you provide more detail? None of your dropdowns appear to be numeric. Are you trying to quantize the non-numeric options, say for gender: male = 1 and female = 2?


回答 (2 件)

Greg 2018 年 12 月 1 日
編集済み: Greg 2018 年 12 月 1 日
If my assumption in the comment above is accurate, this is a perfect use of the "ItemsData" property of AppDesigner components. The "Items" [male,female] will display in the dropdown list, but the "Value" property will take from the "ItemsData" [1,2] list. Then it's a simple matter of accessing and adding the .Value of each dropdown of concern.
Edit: after investigation, it appears there is no way in "Design View" to make the ItemsData numeric. This is a shame because the tooltip explicitly says "1 x n numeric array" is valid. You can either use str2double, or set the ItemsData in the startupFcn.
  11 件のコメント
Jan Siegmund
Jan Siegmund 2020 年 6 月 29 日
@Jonathan Patten Simple, just use the cell of string numbers throughtout your callbacks and whenever you need numeric data, use str2double(app.Dropdown.ItemsData). However MATLAB should let us use numeric data in the first place.


Waleed Sahhary
Waleed Sahhary 2021 年 11 月 21 日
Just add constraint to the parameter, you can edit this parameter to have a rule, the role will be int16 e.g. ..

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