MATLAB: How to apply validation on matlab M-file

errorbox

I want to put a warning message box at the click of a close button in a matlab figure.

   function closed(hObject, eventdata)
               close(gcbf);
               warndlg('are you sure you want to close','!! Warning !!')
              %clear all;
              %close;clear
            end

however this warning dialog box appears when the window is closed! Where should I put this messagebox exactly!

Best Answer

Looks like you have your call to warndlg after "close(gcbf)". Try putting it above that.

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MATLAB: GUI Warning before closed

My solution: write this in the second function written by guide (my_gui_OpeningFcn):

     set(handles.figure1,'CloseRequestFcn',@closeGUI;

Then write an extra function like this:

     function closeGUI(hObject, eventdata, handles)
       selection = questdlg(Close MyGUI?', ...
  'Warning', ...
  'Yes','No','Yes');
     switch selection
         case 'Yes'
           delete(gcf)
        case 'No'
           return
        end

MATLAB: Matlab M-File

You should review the documentation on how to write a function, since your above code is not a correctly written function. First, come up with a name for your function, e.g. myFunction. Then create a new file called myFunction.m somewhere on the MATLAB path (e.g. your working directory). Then in that file put your code. E.g.,

function result = myFunction(V)
result = V;  % <-- allocate the result variable, copying all elements
%

% Insert your code here to create the result variable from the V variable
%
return
end

I will give you some hints about correcting your code:

Change this loop:

for i=1:1:6;  % <-- hard coded for exactly 6 elements

to this

for i=1:numel(V)  % <-- allows any size input

The following test has an error in the logic (compare this carefully with the requirement):

if [V(i)<0 | mod(V(i),2)==0 | mod(V(i),4)==0]

The following line has an error on the right hand side calculation (compare this carefully with the requirement):

    V(i)=i*i;

If you don't see what the errors are, step through a small example by hand and compare that to the code result. E.g., at the command line type this:

V=[10,4,7,-8,-3,-12];
myFunction(V)

Best Answer

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MATLAB: GUI Warning before closed

MATLAB: Matlab M-File

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