how to stop a running script in Matlab

Question

I write a long running script in Matlab  e g   tic  d   rand 5000    a b c    svd d   toc    It seems running forever  Becasue I press F5 in the editor window  So I cannot press C-Break to stop in the Matlab console   I just want to know how to stop the script  I am current use Task Manager to kill Matlab  which is really silly    Thanks

User · Answer

if you are running your matlab on linux  you can terminate the matlab by command in linux consule  first you should find the PID number of matlab by this code   top  then you can use this code to kill matlab  kill   example  kill 58056

User · Answer

Matlab help says this- For M-files that run a long time  or that call built-ins or MEX-files that run a long time  Ctrl C does not always effectively stop execution  Typically  this happens on Microsoft Windows platforms rather than UNIX 1   platforms  If you experience this problem  you can help MATLAB break execution by including a drawnow  pause  or getframe function in your M-file  for example  within a large loop  Note that Ctrl C might be less responsive if you started MATLAB with the -nodesktop option   So I don t think any option exist  This happens with many matlab functions that are complex  Either we have to wait or don t use them

User · Answer

One solution I adopted--for use with java code  but the concept is the same with mexFunctions  just messier--is to return a FutureValue and then loop while FutureValue finished   or whatever returns true  The actual code executes in another thread process  Wrapping a try catch around that and a FutureValue cancel   in the catch block works for me   In the case of mex functions  you will need to return somesort of pointer  as an int  that points to a struct object that has all the data you need  native thread handler  bool for complete etc   In the case of a built in mexFunction  your mexFunction will most likely need to call that mexFunction in the separate thread  Mex functions are just DLLs shared objects after all   PseudoCode  FV   mexLongProcessInAnotherThread    try   while  mexIsDone FV       java lang Thread sleep 100    pause has a memory leak     drawnow   allow stdout err from mex to display in command window   end catch   mexCancel FV   end

User · Answer

Consider having multiple matlab sessions  Keep the main session window  the pretty one with all the colours  file manager  command history  workspace  editor etc   for running stuff that you know will terminate   Stuff that you are experimenting with  say you are messing with ode suite and you get lots of warnings  matrix singular  because you altered some parameter and didn t predict what would happen  run in a separate session   dos  matlab -automation -r  amp      You can kill that without having to restart the whole of Matlab

User · Answer

Since you mentioned Task Manager  I ll guess you re using Windows  Assuming you re running your script within the editor  if you aren t opposed to quitting the editor at the same time as quitting the running program  the keyboard shortcut to end a process is   Alt   F4   By which I mean press the  Alt  and  F4  keys on your keyboard simultaneously    Alternatively  as mentioned in other answers   Ctrl   C  should also work  but will not quit the editor

User · Answer

To add on   you can insert a time check within a loop with intensive or possible deadlock  ie     section toc conditionalBreakOff      where within this section  if  toc  gt  timeRequiredToBreakOff        time conditional break off       return          other options may be                                   1  display intermediate values with pause          2  exit                              in some cases  extreme   kill  quit matlab end

User · Answer

If ctrl c doesn t respond right away because your script is too long complex  hold it   The break command doesn t run when matlab is executing some of its deeper scripts  and either it won t log a ctrl sequence in the buffer  or it clears the buffer just before or just after it completes those pieces of code  In either case  when matlab returns to execute more of your script  it will recognize that you are holding ctrl c and terminate   For longer running programs  I usually try to find a good place to provide a status update and I always accompany that with some measure of time using tic and toc  Depending on what I am doing  I might use run time  segment time  some kind of average  etc     For really long running programs  I found this to be exceptionally useful  http   www mathworks com matlabcentral fileexchange 16649-send-text-message-to-cell-phone content send text message m  but it looks like they have some newer functions for this too

User · Answer

MATLAB doesn t respond to Ctrl-C while executing a mex implemented function such as svd  Also when MATLAB is allocating big chunk of memory it doesn t respond  A good practice is to always run your functions for small amount of data  and when all test passes run it for actual scale  When time is an issue  you would want to analyze how much time each segment of code runs as well as their rough time complexity

[windows] how to stop a running script in Matlab

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