Make a calculator display an error message for non-numerical values.
1 次查看(过去 30 天)
显示 更早的评论
I am trying to program a simple calculator with 2 "edit text" windows. I want it to display an error dialog for non-numerical values. I used the following function at the "edit text" gui callback:
endb=str2num(get(hObject, 'String'));
if isnan(b)
errordlg('Input must be a number', 'Error')
end
handles.edit1=b;
guidata(hObject,handles)
but it only displays the error message if I type in 'nan'. How to make it appear for all non-numerical values?
1 个评论
Jan
2012-7-10
If you set a breakpoint in the 2nd line, you can check, what STR2NUM replies for your non-numerical value. STR2DOUBLE would be safer.
回答(0 个)
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 String 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!