Matrix Input Validation Help

Hello,

I am trying to validate a user input as numeric while forcing the user to repeat if it is not. I currently have this working well as long as the user does not input a letter that is non numeric. I would like it to prompt the user again if they input a string instead of a number. Any help is appreciated.

Thanks

my input looks like

array(r, c) = str2num(input(['Digit for position ', num2str(c), ': '], 's'));
        
        while array(r, c) > 6 || array(r, c) < 0
         
            GUESS(r, c) = str2num(input(['Digit for position ', num2str(cc), ': '], 's'));
        end

Answer 1

[Walter Roberson]

        array(r, c) = str2double(input(['Digit for position ', num2str(c), ': '], 's'));
        
        while isnan(array(r,c)) || array(r,c) ~= fix(array(r,c)) || array(r, c) < 0 || array(r, c) > 6
            array(r, c) = str2double(input(['Digit for position ', num2str(cc), ': '], 's'));
        end

or

array(r, c) = str2double(input(['Digit for position ', num2str(c), ': '], 's'));
while ~ismember(array(r,c), 0:6)
   array(r, c) = str2double(input(['Digit for position ', num2str(cc), ': '], 's'));
end

[Scott Tobin]

Okay, thank you.

However, I know have the issue of it interpreting the input as a string. Inputing 'w' yields unrecognized funciton or variable 'w'

[Scott Tobin]

Actually that was on me with a typo but I do have...

Unable to perform assignment because the size of the left side is 1-by-1 and the size

of the right side is 0-by-0 for the array in the loop

[Scott Tobin]

Ope spotted was supposed to be str2double not str2num in the second. Appreciate the help I haven't seen it done in that manner before thanks for the tip