Check edit text for a symbol

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Mahmoud Elshazly 2019-10-11

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https://ww2.mathworks.cn/matlabcentral/answers/484856-check-edit-text-for-a-symbol

回答： Adam Danz 2019-10-11

Hello there,
I'm making a GUI for Compressible flow calculations in which i have 33 edit texts for all my variables. All the values pass through the algorithm and solve for each others (using knowns to get Unknowns). I want the user to be able to specify a certain unknown by typing "?" in editbox for which I can know that he only needs this value and represent it in a message box. How can I do the edit box check for "?" symbol in this case?

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Answer 1

Adam Danz 2019-10-11

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The "String" property of your editbox contains the content of the text. You can use strcmpi() to determine whether the text box contains a "?" or not. The solution below also uses strtrim() to get rid of any unintended empty spaces.

isUnknown = strcmpi(strtrim(handles.Textbox1.String),'?');

Where handles.Textbox1.String is the handle to your editbox.

isUnknown will be a logical true/false.