Instead of outputting error how to display warning?

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Dc215905
Dc215905 2021-7-1
回答： Animesh 2023-2-9
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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Yazan
Yazan 2021-7-1
You may check if the user enters a number as follws:
x = input('Insert a number\n', 's');
if isnan(str2double(x))
error('Enter a number without letters');
end

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回答（1 个）

Animesh
Animesh 2023-2-9
Hello,
According to my understanding you want to display a custom message when the user inputs wrong data format.
We can display a custom error message with the help of error function.
Sample Code: -
x = input("Input number\n",'s') %Input from the user
if isempty(str2num(x))
error("The input is not of correct format.\n")
end
For further reference on error use: - https://www.mathworks.com/help/matlab/ref/error.html
For further reference on str2num use: - https://www.mathworks.com/help/matlab/ref/str2num.html

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