How to/Can I send commands to Matlab remotely

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Jay Kemper
Jay Kemper 2012-7-18
I have Matlab running on a computer, and I'm wondering if there is a way to send a command to Matlab from a remote computer. I understand this would require Matlab to open a port and be listening. Aside from writing a thread that runs in the background while Matlab is running, is there capability already in Matlab?
Example:
Matlab started on computer "sim"
Program in "interface" C++ code, independent program on remote computer:
#include "MatlabInterface.h"
int main(int argc,char*argv[])
{
MatlabInterface matlab("sim",PORT_NUMBER);
std::string cmd("a=4");
matlab.sendCommand(cmd);
return 0;
}
where "MatlabInterface" is a class that sets up ethernet socket calls and the "sendCommand" send a string of a certain length over that connection.
Edit:
Long story short, I'd like to run a command in the command window, but the input is an external source, not the Matlab window. Send a message to Matlab that says "Hey Matlab, run this string in your command window."

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回答（2 个）

Albert Yam
Albert Yam 2012-7-18
What is it that you want to do remotely? If you want total control of Matlab, then just VNC.
If you want to run a script, my first thought was to have a urlread, read something like Etherpad or Evernote, to flip a trigger that is set on a timer function. Not sure if that would work like I imagine.
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Albert Yam
Albert Yam 2012-7-18
http://www.mathworks.com/help/techdoc/ref/urlread.html
urlread reads the page as a string, have some keyword as the trigger (so you can regexp/strfind to find it) and eval the portion of the string after that. (Maybe an end keyword as well).
But I guess that is for shorter/simpler commands. How about uploading an M-file or txt-file to Dropbox/Google drive that you have access to, and urlwrite/run that directly. Start with an empty file, upload one with commands remotely. Not sure how files are saved there, and/or if the url changes.

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Jason Ross
Jason Ross 2012-7-18
A few ways I can think if doing this:
  • Parallel Computing Toolbox can have a MATLAB worker running on a remote server. When you submit a command, it runs on the remote machine's MATLAB worker.
  • Instrument Control Toolbox has a way of providing communication over TCP/IP
  • There is a TCP/UDP/IP Toolbox in the File Exchange
  • You could use the iPhone/iPad application and connector to connect back to a MATLAB running on your desktop.
  • Traditional remote control applications: VNC, Remote Desktop
  • If the remote machine is Linux, you can use ssh/rsh to run MATLAB in a terminal shell
There are probably a few others I'm missing or that other people have done/implemented over time. Albert's suggestion of a polling function would also work, with the remote session looking for work on some set interval. Or finding work, generating an m script, then running MATLAB, passing the name of the script to it and returning results.
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Jay Kemper
Jay Kemper 2013-1-18
编辑：Jay Kemper 2013-1-18
This is very close. I have the Parallel Computing toolkit, and Java can be used for the Socket command. I have successfully written a function that will listen for a string and then execute that string via "evalin('base','command')".
For a simple example, I use the function
function [] = thefunction()
evalin('base','g=56');
end
That creates a variable g and sets it to 56, but when I run
batch('thefunction',0,{});
it doesn't do anything of the sort in the base workspace. Any ideas?
Jason Ross
Jason Ross 2013-1-23
The worker that's running remotely is an entirely different process than a MATLAB that would be started on the remote machine, so I don't think they are going to communicate as you would like.

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