Can I open multiple instances of MATLAB using ActiveX?

I am trying to set up MATLAB as an ActiveX automation server. However, I noticed MATLAB is using the same environment when two clients are connected. This caused the variables to be corrupted. I would like to be able to generate additional copies of MATLAB having separate environments with new clients.

Answer 1

[MathWorks Support Team]

In MATLAB 5.2 and earlier versions it was not possible to instantiate multiple copies of MATLAB via ActiveX.

As of MATLAB 5.3, it is possible to do this. Instead of using a ProgID of "Matlab.Application" when instantiating MATLAB, use "Matlab.Application.Single". For example use the following:

set Matlab1 = CreateObject("Matlab.Application.Single")
set Matlab2 = CreateObject("Matlab.Application.Single")

This will create two separate instances of MATLAB in Visual Basic. See Chapter 7 of the External Interfaces/API Guide for more details on using MATLAB as an ActiveX automation server:

https://www.mathworks.com/help/matlab/matlab_external/creating-com-objects.html

[ES]

Does this really work?

I use MATLAB R2016B. And this is what I see.

Step 1: I dispatch a matlab instance with '.Single' option and run a script1. It starts and executes.

Step 2: I dispatch an other matlab instance with '.Single' option and run a script 2. It starts and executes. The first instance and script1 execution is blocked.

After script 2 executes, script1 executes in 2nd instance.

[Sam Cook]

Do you mean to say that Script1 stops mid-execution on Matlab1, then continues execution on Matlab2? What MATLAB code is being run from the scripts?

I expect there is something else going on here, since (to my knowledge) it would be nontrivial to pause execution and resume it on another MATLAB instance.