[HELP] required for exception handling during user input

Hi need help!

I need to capture user input using getkey(). However the user is only allowed to enter values between 1 and 9. If user presses something else it should wait (can give an error message too) for the user to press a valid key (1-9).

Code please.

Thanks in anticipation.

Answer 1

[Sean de Wolski]

what is getkey()?

docsearch getkey

doesn't return any results. If you want the keypressfcn of a figure to perform this test, here is a small demo:

All in one file ans_keypressexample.m

function ans_keypressexample
  figure('keypressfcn',@clicked); %make a figure

function clicked(~,evt)
  key = str2double(evt.Key); %get the key
  if isnan(key)||key==0 %is it between 1 and 9?
      error('Booo!'); %no :(
  else
      disp('yay!!');
  end

[helpseeker]

GETKEY() waits for a keypress and returns the ASCII code, but dont think this is a standard function in matlab. It has been added separately to our matlab.

Thanks. I will try the above code.

Answer 2

[Walter Roberson]

As you are using a File Exchange contribution, edit the source for your own purposes. http://www.mathworks.com/matlabcentral/fileexchange/7465-getkey