[kepler-dev] Build Broken (by MatlabExpression.java?)

[Tristan King]

Interesting,
My actor uses the Runtime and Process classes, however they themselves 
use builtin JNI functions.

If you can get my more info on invoking matlab without JNI that'd be great.

I'm not sure exactly what you mean when you say JNI is broken under 
windows cygwin. i can run my actor fine from cygwin, it's just a shell 
after all and uses the same version of java that the rest of the system 
uses. Maybe it's just that i'm not familiar with the environment you're 
using it in tho.

--Tristan

Christopher Brooks wrote:
> Hi Tristan,
> 
> The Ptolemy MatlabExpression actor uses the JNI to communicate with
> Matlab.  I don't think a separate process is invoked.  
> 
> I have not looked at Matlab lately, though Ernesto Wandeler recently
> told me he had been able to invoke Matlab via Java and not use
> JNI.
> 
> JNI under Windows Cygwin is utterly broken.   JNI using Microsoft
> VC++ works.
> 
> 
> _Christopher
> 
> --------
> 
>     My bad with that. I always figured that that java compliance settings in 
>     eclipse meant that the code would compile under 1.4 (or maybe it does 
>     and i'm doing something wrong). I've modified the actor now and compiled 
>     it using 1.4 to make sure it works, and will commit it again later on 
>     today (when i'm 100% sure it wont break anything :)).
>     
>     I've looked into the java interfaces that come with matlab, and as far 
>     as i can tell they're not much use to us.
>     
>      From what i've managed to figure out, they just allow people to write 
>     java classes for use inside matlab's own jvm (i.e. the classes must be 
>     called from inside matlab), and don't do anything when run from a 
>     standard jvm.
>     
>     If anyone knows any different, please let me know. I'm not a big fan of 
>     the whole spawning additional processes to preform these tasks, and even 
>     less of having to parse text output to decipher the results. But for now 
>     i don't know of any other way of doing this.
>     
>     --Tristan
>     
>     Christopher Brooks wrote:
>     > BTW - The Ptolemy Matlab expression actor uses JNI to communicate
>     > with Matlab.  I believe there is now a pure Java Matlab interface
>     > which is much more robust than JNI.  I would support tossing the
>     > Ptolemy Matlab expression actor for a non-JNI Matlab actor.
>     > 
>     > Nandita create a MatlabStartScript utility that looks like it starts
>     > a remote Matlab process using Runtime.getRuntime().exec().  
>     > I'm not so sure if this is the right thing, since it starts a 
>     > separate process each time.  It might be better to have a 
>     > more integrated actor?  However, I'm not sure what the plan is
>     > for this actor, so there could easily be good uses for it.
>     > 
>     > 
>     > _Christopher
>     > 
>     > --------
>     > 
>     >     MatlabExpression code is apparently keeping the nightly build from 
>     >     compiling. Would however is working on this please fix ASAP!
>     >     
>     >     (And is this different that the Matlab actor in PTII ? (which we coul
>    d 
>     >     put in Kepler)
>     >     
>     >     Dan Higgins
>     >     NCEAS
>     >     _______________________________________________
>     >     Kepler-dev mailing list
>     >     Kepler-dev at ecoinformatics.org
>     >     http://mercury.nceas.ucsb.edu/ecoinformatics/mailman/listinfo/kepler-
>    dev
>     > --------
>     > _______________________________________________
>     > Kepler-dev mailing list
>     > Kepler-dev at ecoinformatics.org
>     > http://mercury.nceas.ucsb.edu/ecoinformatics/mailman/listinfo/kepler-dev
>     > 
>     
>     -- 
>     Tristan King                            | Ph: (07) 4781 6911
>     DART project team                       | Email: Tristan.King at jcu.edu.au
>     James Cook University                   | Web: http://dart.edu.au
>     Townsville QLD 4814                     | http://plone.jcu.edu.au/dart/
>     Australia                               |
> --------
> 

-- 
Tristan King                            | Ph: (07) 4781 6911
DART project team                       | Email: Tristan.King at jcu.edu.au
James Cook University                   | Web: http://dart.edu.au
Townsville QLD 4814                     | http://plone.jcu.edu.au/dart/
Australia                               |