open Linux Konsole from Matlab
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Hello,
on Ubuntu 18.04 shell typing
konsole &
a new window with console opens, as expected.
In Matlab typing
[status, cmdout] = system('konsole &', '-echo')
nothing happens...
The output is:
status =
0
cmdout =
0×0 empty char array
How to open a new console in a new thread from Matlab?
How to hand over even parameters or commands into this new console?
Executing e.g.
[status, cmdout] = system('jedit &', '-echo')
runs as expected. jedit opens and can be operated as usual.
Thanks for your answers
5 Comments
Andreas Schwager
on 27 Jul 2021
Raymond Norris
on 27 Jul 2021
Can't tell you why there's an issue with calling konsole (have you tried calling xterm? that works for me). But I'm wondering what's the end goal? You've tagged this post as parallel computing. I'm assuming you don't just need to fire up a terminal window. What do you want to do once the terminal is running? Might be able to help with that piece.
Andreas Schwager
on 27 Jul 2021
Raymond Norris
on 27 Jul 2021
Just to clarify a term, system will launch a separate process, not thread. Agreed, it ought to run on a different core than MATLAB, but you could also imagine that MATLAB sees all cores (or at least many of them) and is spawning computation threads (i.e. maxNumCompThreads) on them. Since you're calling system and and not formally scheduling the process, it could be hit or miss.
I don't think you want to call xterm. But you might need to set the LD_LIBRARY_PATH before launching your app. For example:
[status,cmdout] = system('export LD_LIBRARY_PATH=/path/to/lib1_dir:/path/to/lib2_dir && rviz rviz -d runMyRvizLaunchFile.rviz');
disp(['cmdout: ' strtrim(cmdout) ' status: ' num2str(status)])
3 comments:
- Are you sure you're actually running into an issue? The system status comes back as 0.
- Not sure why the system call is calling rviz twice, but I assume you understand why. Seems like you'd only call it once.
- Notice I'm using strtrim, instead of cmdout(1:end-1), as the second output of system (cmdout) can have leading new lines as well.
Andreas Schwager
on 27 Jul 2021
Accepted Answer
Bjorn Gustavsson
on 27 Jul 2021
From the man-page of xterm I get this suggestion:
-e program [ arguments ... ]
Which should be applicable to your case?
HTH
1 Comment
Andreas Schwager
on 27 Jul 2021
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