Hi Ricardo,
Interfacing to C is not that difficult, though it is difficult to do in
a portable manner.
See
http://docs.oracle.com/javase/7/docs/technotes/guides/jni/
I used JNA (https://github.com/twall/jna) with good success to interface
to FMI, see org/ptolemy/fmu.
The JNAerator will create stub code for you from C and C++
http://code.google.com/p/jnaerator/
Ptolemy II includes ways to access C code, see the faq links below.
See $PTII/bin/vergil $PTII/ptolemy/cg/lib/demo/Scale/ScaleC.xml
For interfacing to a C library that is complex, I suggest using JNA to
create some wrapper Java code and then write actors that use the Java
wrapper code.
I don't really understand your initial question though. What are you
trying to do?
You said you wanted to create a "scope workflow wide". Typically, we do
this by placing a parameter into a model.
If you were writing Java code, you would create a parameter in the
container of an actor, but this is not very good actor-oriented programming.
For information about writing actors in Java, see the designing actors
chapter of http://www.eecs.berkeley.edu/Pubs/TechRpts/2008/EECS-2008-28.html
_Christopher
On 10/1/12 6:04 PM, [email protected] wrote:
Hi Derik,
Thanks for the email. Somehow I need to interface with C/C++ codes
as there are codes that I will need written in C/C++.
It is good to know that there is an active forum on Kepler.
Cheers,
Ric
*From:*Derik Barseghian [mailto:[email protected]]
*Sent:* Tuesday, 2 October 2012 10:56 AM
*To:* Pascual, Ricardo (CMAR, Dutton Park)
*Cc:* [email protected] Users
*Subject:* Re: [kepler-users] Kepler: Array instatiation and Array
element assignment
Hi Ric,
I found some relevant info here;
http://ptolemy.eecs.berkeley.edu/ptolemyII/ptIIfaq.htm#Interfacing to
C/C++
<http://ptolemy.eecs.berkeley.edu/ptolemyII/ptIIfaq.htm#Interfacing%20to%20C/C++>
http://ptolemy.eecs.berkeley.edu/ptolemyII/ptIIfaq.htm#CodeGen
The descriptions make it sound like these aren't being worked on
anymore, but I've seen ptolemy SVN check-ins that seem to do w/ C code
generation and copernicus in the recent past, so I'm not sure about that.
Note you can call any arbitrary program using the External Execution
actor.
If you're trying to develop new actor(s), customizing the RExpression
or Python actors, or writing new ones in Java is probably easiest.
Derik
On Oct 1, 2012, at 8:46 AM, "Edward A. Lee" <[email protected]
<mailto:[email protected]>> wrote:
The SetVariable actor is rather tricky to use.
Depending on the director that you choose and the parameters you set,
it could be nondeterministic. Why go through a variable? Why not just
feed the data from DirectoryListing to where it is needed?
If there are lots of places it is needed, you might consider using
Publisher and Subscriber. These, at least, are assured of determinism.
It is a bit of a change of mindset to "think in kepler" :-)
It's quite important which director you pick. They all provide
a concurrent model of computation, but their behaviors are quite
different...
Edward
On 9/30/12 8:49 PM, [email protected]
<mailto:[email protected]> wrote:
Hi Edward.
Thanks for the email. I am still trying to to learn how to think
properly in kepler. Any how the best solution I can come up with is
defining a parameter actor and setting the value using the
VariableSetter actor. I believe you created this actor. So if I set
it to an array of strings dirList will be an array of string as in below.
*dirList #"declare the variable as ParameterActor"
DirectoryListingActor -----> VariableSetterActor(with .variablename
=dirList)
There might be a more elegant solution but that will have to wait
until I know more of kepler. As you pointed out you can do this with
the various Expression like RExpression and others. BTW is there a
hook to C++ in kepler?
Kind regards.
Ric
________________________________________
From: Edward A. Lee [[email protected] <mailto:[email protected]>]
Sent: Monday, 1 October 2012 7:02 AM
To: Pascual, Ricardo (CMAR, Dutton Park)
Cc: [email protected]
<mailto:[email protected]>; [email protected]
<mailto:[email protected]>; [email protected] <mailto:[email protected]>
Subject: Re: [kepler-users] Kepler: Array instatiation and Array
element assignment
Hi Ric,
I'm not sure what you mean by "programmatically."
What you describe below is a program in an imperative language.
In Kepler, the primary imperative language is Java. So you
could write an actor in Java that does this.
There are also hooks to write actors in MATLAB and Python,
which are also imperative languages.
If instead you are trying to define a workflow that builds
this variable, then the only director with an imperative
flavor is the FSM. I think it could be awkward to define
it in an FSM.
You could use a dataflow director or PN and SequenceToArray
actor, but these are distinctly not imperative.
In Kepler, parameters are defined as expressions in the
Ptolemy expression language.
The expression language is also not an imperative language.
It is a functional language. So you don't actually specify
sequences of steps for defining variables.
It occurs to me that it could be very useful to define
subclass of Parameter, say PythonParameter, that specifies
a parameter value that is initialized by running a Python
script... This would probably be fairly easy to write...
Any interest in this?
Edward
On 9/30/12 12:39 PM, [email protected]
<mailto:[email protected]> wrote:
Hi All,
Oooops wrong title.
Thanks,
Ric
________________________________________
From: [email protected]
<mailto:[email protected]>
[[email protected]
<mailto:[email protected]>] On Behalf Of
[email protected] <mailto:[email protected]>
[[email protected] <mailto:[email protected]>]
Sent: Sunday, 30 September 2012 9:11 PM
To: [email protected]
<mailto:[email protected]>; [email protected]
<mailto:[email protected]>; [email protected] <mailto:[email protected]>
Subject: [ExternalEmail] Re: [kepler-users] netCDF
Hi All,
I am about a week old into Kepler and having difficulty defining an
array variable programmatically. I have search the internet for this
to no avail. I know how to do it as a constant by assigning the
value = {"x1", ...}.
What I like to do is define a variable with scope workflow wide say
string fileNames[];
then assign values to it as in
fileNames[0] = "file0"
fileNames[1] = "file1"
and so on.
Thank you very much,
Ric
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--
Christopher Brooks, PMP University of California
CHESS Executive Director US Mail: 337 Cory Hall
Programmer/Analyst CHESS/Ptolemy/Trust Berkeley, CA 94720-1774
ph: 510.643.9841 (Office: 545Q Cory)
home: (F-Tu) 707.665.0131 cell: 707.332.0670
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