MATLAB: Checking that a user input is an integer

integer

The user is told to input an integer between 1 and 59 but I want an error message to display if the value they enter is not an integer. This is what I have so far:

prompt = {'Enter your first integer between 1 and 59'}; 
dlg_title = 'User inputs';
num_lines = 1;
answer = inputdlg(prompt,dlg_title,num_lines);
u=str2double(answer{1});

Best Answer

There are several ways of testing to see if the returned value is an integer.

You want to see if there is any non-zero value to the right of the decimal, so test for that. You can also experiment with the rem or mod functions.

Related Solutions

MATLAB: Checking dialog box that gathers user input

Lucky for you, I already have a code snippet for you.

% Ask user for one integer number.
defaultValue = 45;
titleBar = 'Enter an integer value';
userPrompt = 'Enter the integer';
caUserInput = inputdlg(userPrompt, titleBar, 1, {num2str(defaultValue)});
if isempty(caUserInput),return,end; % Bail out if they clicked Cancel.
% Round to nearest integer in case they entered a floating point number.
integerValue = round(str2double(cell2mat(caUserInput)));
% Check for a valid integer.
if isnan(integerValue)
    % They didn't enter a number.  
    % They clicked Cancel, or entered a character, symbols, or something else not allowed.
    integerValue = defaultValue;
    message = sprintf('I said it had to be an integer.\nTry replacing the user.\nI will use %d and continue.', integerValue);
    uiwait(warndlg(message));
end

Feel free to adapt as needed.

MATLAB: How to limit a set of input data, 6 values, to a min and max point and as an integer

if min(user)<1 || max(user)>59
  error("Check the input")
endif

Best Answer

Related Solutions

MATLAB: Checking dialog box that gathers user input

MATLAB: How to limit a set of input data, 6 values, to a min and max point and as an integer

Related Question