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Instead of outputting error how to display warning?

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Dc215905 on 1 Jul 2021
Commented: Dc215905 on 1 Jul 2021
I have a GUI where users are typing values into a table. In order for the calculations to work they have to type in numbers and not letters. This way i can convert the numbers using str2num.
Is there a way to check if str2num will work, and if it doen't then I can display a msgbox telling the users to only type in numbers?

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