Thread Subject: Callilng Matlab from Java

Does anyone know if how to call Matlab Fucntions from a Java
Application (Not calling java objects FROM MATLAB)
?
I have some code and data from Java, but I need to access
functions in Matlab in order to create PeakFit Graphs.

Please Help

"Uriel " <uribre@yahoo.com> wrote in message
<f97sib$bql$1@fred.mathworks.com>...
> Does anyone know if how to call Matlab Fucntions from a Java
> Application (Not calling java objects FROM MATLAB)?


http://www.mathworks.com/company/newsletters/news_notes/win02/patterns.html
http://www.cs.virginia.edu/~whitehouse/matlab/JavaMatlab.html

Note: undocumented & unsupported

Yair Altman
http://www.ymasoftware.com

"Uriel " <uribre@yahoo.com> wrote in message
<f97sib$bql$1@fred.mathworks.com>...
> Does anyone know if how to call Matlab Fucntions from a
Java
> Application (Not calling java objects FROM MATLAB)
> ?
> I have some code and data from Java, but I need to access
> functions in Matlab in order to create PeakFit Graphs.
>
> Please Help
>
>

Uriel, could you tell me more about why you want to call
MATLAB from Java? More importantly, does it need to be
syncrhonous or not?

"Bill York" <BillDotYork@MathWorks.com> wrote...
> Uriel, could you tell me more about why you want to call
> MATLAB from Java? More importantly, does it need to be
> syncrhonous or not?


A good reason I once wanted to do this was when I wanted to
have a multi-threaded application. Matlab is basically
single-threaded and even timers & HG callbacks, which should
run in separate threads, actually use only the one
single-threaded computational engine, AFAIK. I thought that
calling the Matlab computational engine from Java treads
would do the trick. Unfortunately it did not, since Matlab
is not only single-threaded, but actually blocks until
processing is done, preventing re-entrancy. Having a
reentrant and truly multi-threaded engine is a wet dream,
but I must admit this is a pretty big challenge, so I'm not
really expecting it soon.

Another reason to call Matlab from Java is if you have an
existing Java-based GUI in which you want to incorporate
Matlab-based computations. Since Java enables richer GUIs
than vanilla Matlab, this would be an ideal combination. One
can, of course, design Java GUIs from within Matlab, but
this involves undocumented functions and hacks that few are
familiar or comfortable with (all those awtinvokes...). Not
to mention the fact that profiling or debugging Java called
from Matlab is currently impossible (AFAIK again), while the
reverse is possible.

Yair Altman

There are some guys using JNA to do this:

https://jna.dev.java.net/servlets/BrowseList?
list=users&by=thread&from=935824

JNA supports all sorts of Java<->native communication, including native->Java
callbacks. It's also cross-platform, and probably runs on more systems than
matlab itself does.