Character input error message !!

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Mohamed Djama
Mohamed Djama 2015-3-21
回答： Giorgos Papakonstantinou 2015-3-21
Hello there, i want my inputs to be a positive number not a negative number or a text just positive number starting from zero, therefore i used this code,
m = str2num(get(handles.m,'string'));
v = str2num(get(handles.v,'string'));
if ( m >= 0 && v >= 0)
else
errordlg( 'The Inputs must be a positive numbers' )
end
This error is only for the negative values, i want to add if the input is text show an error so what should i add to this code .

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回答（1 个）

Giorgos Papakonstantinou
If the string you get from handles.m is a char class then str2num will produce an empty matrix.
>> str2num('hello')
ans =
[]
Therefore, your else statement will be invoked and apparently, you will not have a problem. However, if you want to determine whether the item is character array you may use ischar.

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