MATLAB Answers

can i pause matlab excution while it is already running

340 views (last 30 days)
gasser
gasser on 26 Mar 2013
Commented: Walter Roberson on 15 Sep 2018
hi every on ,
can i pause matlab excution while it is already running
(i.e) if i have a script and is already running can i pause it for any time then resuming it again .
thanks a lot .

  2 Comments

LJ
LJ on 12 Jul 2015
You can use this clever function the next time. It will allow you to pause the execution any time you want just with the click of a button and then you can resume it pressing F5.
Walter Roberson
Walter Roberson on 31 May 2016
That will not work unless there is a figure() or drawnow() or pause() or waitfor() or uiwait() somewhere in the code. Pushbuttons are not serviced until the graphics queue is processed, which requires one of the above to happen.

Sign in to comment.

Answers (5)

Nick Hilton
Nick Hilton on 12 Oct 2015
If you're on a UNIX platform, then there is an easy way to do this:
Simply run your script on the command line in a BASH shell like so:
matlab -nodesktop -nosplash -r "run_some_script(arg1, arg2, ...)"
Now that it is running, you can pause execution by pressing CTRL+Z, which pauses execution and returns you to the BASH prompt again. To continue execution, execute the 'fg' command to put the suspended job back into the foreground.
Another advantage to this approach, most graphical terminals provide an output buffer, and one can scroll and examine the output buffer without pausing the execution, and without new output causing the buffer to scroll the screen. So I can look at the buffer to tell where the execution is in a loop, for example, without pausing anything.
I hope this helps someone that finds this topic.

  3 Comments

Chuck
Chuck on 31 May 2016
Very clever, thank you! I'm assuming there is not a way to do this on a Windows machine?
Benoit Espinola
Benoit Espinola on 13 Sep 2018
This is gold!
"Another advantage to this approach, most graphical terminals provide an output buffer, and one can scroll and examine the output buffer without pausing the execution, and without new output causing the buffer to scroll the screen. So I can look at the buffer to tell where the execution is in a loop, for example, without pausing anything."
And how can we consult this output buffer?
Would you say that consulting the output buffer could give me information on the state of the execution of the code?
Many thanks,
Benoit
Walter Roberson
Walter Roberson on 15 Sep 2018
To consult the output buffer, use the Page Up / Page Down keys, or use whatever scrollbar your terminal application provides. Here, "output buffer" refers a configurable number of lines of stdout .
For example on OS-X, inside the Terminal.app utility, Preferences -> Profiles -> Window permits me to configure whether I want scrollback to be limited to available memory, or to a specific number of output lines.

Sign in to comment.


Image Analyst
Image Analyst on 31 May 2016
With R2016a, there is now a Pause button on the tool ribbon that appears when your code runs:

  0 Comments

Sign in to comment.


Mahdi
Mahdi on 27 Mar 2013
You can pause the script/function that you're running for a specified amount of time without quitting the script.
You can use the pause(n) function to stop the script for n seconds.
If you're using a GUI, I would suggest looking at uiwait.

  0 Comments

Sign in to comment.


Jan
Jan on 26 Mar 2013
No.

  2 Comments

Jan
Jan on 26 Mar 2013
Sorry, I did not want to pollute my answer by too many details: You can stop the execution by hitting Ctrl-C, but afterwards you cannot resume.
Actually, the results must be correct, if you force the computer to fall asleep, e.g. a hibernation. But I would test this exahsutively before I'd trust the results.
Walter Roberson
Walter Roberson on 26 Mar 2013
You might also be able to suspend MATLAB from the operating system.

Sign in to comment.


Omer Moussaffi
Omer Moussaffi on 14 Dec 2014
Not without preparation. You could add the command 'keyboard' into the script at a specified place, and then it would give you back control. You then do your changes, and either call 'return' to resume or dbquit to stop the script.

  0 Comments

Sign in to comment.

Sign in to answer this question.