MATLAB: Check String for letters

editboxnumbersstring

Hey Guys, I have an Editbox and I want to start my program only if the Editbox Input are only numbers. Unfortunately, get(handle.editbox,'String') gives the Input back as String. So how can i check whether the user only entered numbers ?

isnumeric wont work i guess

Best Answer

One way

    is_num = not( isnan( str2double( str ) ) );

    is_num = not( isnan( str2double( get(handle.editbox,'String') ) ) );

&nbsp

Won't work if user inputs "nan" :-(

    >> isnumeric( nan ) 
    ans =
         1

Related Solutions

MATLAB: Changing letters to other letters with regexprep

You don't need regexprep, using ismember and indexing is simpler:

>> str = 'a':'z'
str = abcdefghijklmnopqrstuvwxyz
>> old = 'bcd';
>> new = 'abc';
>> [X,Y] = ismember(str,old);
>> str(X) = new(Y(X))
str = aabcefghijklmnopqrstuvwxyz

Note that this works efficiently for any characters, not just a limited subset. In order to use regexprep you would probably need to use a dynamic replacement expression.

MATLAB: How to prompt a user to enter a string, then check that the entered string is one of the acceptable entries. If it is not, user must enter it again.

I think this is what you intended ...

unit = input('TEXT PROMPTING USER TO INPUT UNITS (EXAMPLE OF ACCEPTED UNITS (unit q, unit w, unit e, unit r) ', 's');
while not(strcmpi(unit, 'q') || strcmpi(unit, 'w') || strcmpi(unit, 'e') || strcmpi(unit, 'r'))
    unit = input('ERROR MESSAGE IF UNACCEPTED UNIT IS ENTERED (DISPLAYING ACCEPTED UNITS AGAIN: ', 's');
end

rather than checking that the value of unit was equal to that series of logical statements.

Best Answer

Related Solutions

MATLAB: Changing letters to other letters with regexprep

MATLAB: How to prompt a user to enter a string, then check that the entered string is one of the acceptable entries. If it is not, user must enter it again.

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