How to break out of the program?

1
Hi all, how to break out of the program? Tried applekey-period but didn't work for os X
(worked for os 9 before). Thanks.
2
During the development phase of your OSX code, I want to echo what
others have advised before.

Put all you code in a try-catch statement with commands in the catch
section that release Screen when an error occurs. Something like
this:

try
% All your code here.
catch
% Basic list of commands that return you to your normal desktop.
ShowCursor;
Screen('CloseAll');
clear screen; % Not "clear all", so your variables will still
exist in workspace.
lasterr % No semicolon on "lasterr" so that it dumps to command window.
end

And then within your code in the try section, include a KbCheck
routine that intentionally crashes the program (e.g., simply try to
access a non-existing variable) within any long loops that you might
want to end prematurely. In one of my programs, at the top of the
trial loop, I have the following which allows me to press Q to quit
the program instead of starting the next trial:

% Wait for '0' number pad key to start trial.
response = [];
while (isempty(response))
WaitSecs(0.001);
[keyIsDown,secs,keyCode] = KbCheck;
if (keyIsDown)
if (length(find(keyCode)) > 1)
% Do nothing.
elseif (find(keyCode(KbName('0'))))
response = 1;
elseif (find(keyCode(KbName('q'))))
dummy_variable_to_quit_program; % Crashes here.
end
end
end

Daniel Shima
Vanderbilt Vision Research Center


On 9/16/05, rrenteri <rrenteri@...> wrote:
> --- In psychtoolbox@yahoogroups.com, "Fang" <fxj018100@u...> wrote:
> > Hi all, how to break out of the program? Tried applekey-period but
> didn't work for os X
> > (worked for os 9 before). Thanks.
>
> After pressing applekey-period, the screen is still hiding the Matlab
> command window. Try blindly typing "clear all" or
> "Screen('CloseAll')" (without the double-quotes), which should close
> the window and reveal the Finder.
>
> Best,
> Rene' Renteria
> Dept. Ophthalmology, UCSF
> (Also, I think typical etiquette here asks that you include your full
> name and an affiliation when posting.)
3
Thanks!

Best,
Fang
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*****************************************
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Fang Jiang
School of Behavioral and Brain Sciences
GR 4.1
The University of Texas at Dallas
Richardson, TX 75083-0688
PHONE: 972-883-4983
FAX : 972-883-2491
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