[kepler-dev] How do I create nested loops in Kepler

[Dan Higgins]

Edward,
    Thanks for your response. I, too, would like to get a copy of your 
paper.
Dan

Bertram Ludaescher wrote:

>Edward:
>
>This is very interesting and I'd like to get a hold of it.
>Maybe one of your students could scan it and creat a PDF version!? 
>
>Also, in reply to Dan's comment:
>
> > >I've tried various ways using Ramp actors and Composite actors but
> > >cannot seem to get this simple case to work.
>
>I guess that this is not as simple a case as one might wish (in simple
>dataflow and/or block diagram languages).. just like doing procedural
>loops in functional or logic programming is tricky (and one has to use
>recursive patterns instead)
>
>Probably Edward's paper will be very instructive in dealing with these
>issues. Also, I think there are nice new opportunities for doing
>procedural stuff nicely in Kepler by using Ptolemy's state machines...
>
>Bertram
>
>
>
>
>Edward A. Lee writes:
> > 
> > Dan:
> > 
> > This is a very good question. In fact, I wrote a paper once on this
> > subject:
> > 
> > E. A. Lee, "Recurrences, Iteration, and Conditionals in Statically
> > Scheduled Block Diagram Languages," in VLSI Signal Processing III,
> > Ed. R. W. Brodersen and H. S. Moscovitz, IEEE Press, New York, 1988.
> > 
> > This paper is not on the web, although I could get you a copy if you like...
> > 
> > For your example, the attached model illustrates one simple technique.
> > It also elaborates on it, producing the iteration indices for both
> > the outer an inner iterations. There are also much more elaborate
> > models one can create using higher-order components, like the
> > IterateOverArray actor and many others that we haven't gotten
> > around to porting from Ptolemy Classic...
> > 
> > Edward
> > 
> > 
> > 
> > At 03:58 PM 7/5/2005 -0700, Dan Higgins wrote:
> > >Hi All,
> > >
> > >     I am having great difficulty in figuring out how to handle various
> > >looping constructs in Kepler/Ptolemy. So I ask if someone can explain
> > >how to handle nested loops (using SDF and/or PN directors)?
> > >
> > >     For example, assume I want to count from 0 to 3 twice in a row so
> > >that the output on a final text display is
> > >0
> > >1
> > >2
> > >0
> > >1
> > >2
> > >
> > >I've tried various ways using Ramp actors and Composite actors but
> > >cannot seem to get this simple case to work.
> > >
> > >Thanks,
> > >Dan
> > >
> > >--
> > >*******************************************************************
> > >Dan Higgins                                  higgins at nceas.ucsb.edu
> > >http://www.nceas.ucsb.edu/    Ph: 805-893-5127
> > >National Center for Ecological Analysis and Synthesis (NCEAS)
> > >Marine Science Building - Room 3405
> > >Santa Barbara, CA 93195
> > >*******************************************************************
> > >
> > >_______________________________________________
> > >Kepler-dev mailing list
> > >Kepler-dev at ecoinformatics.org
> > >http://mercury.nceas.ucsb.edu/ecoinformatics/mailman/listinfo/kepler-dev
> > 
> > ------------
> > Edward A. Lee
> > Professor, Chair of the EE Division, Associate Chair of EECS
> > 231 Cory Hall, UC Berkeley, Berkeley, CA 94720
> > phone: 510-642-0253 or 510-642-0455, fax: 510-642-2845
> > eal at eecs.Berkeley.EDU, http://ptolemy.eecs.berkeley.edu/~eal  _______________________________________________
> > Kepler-dev mailing list
> > Kepler-dev at ecoinformatics.org
> > http://mercury.nceas.ucsb.edu/ecoinformatics/mailman/listinfo/kepler-dev
>  
>


-- 
*******************************************************************
Dan Higgins                                  higgins at nceas.ucsb.edu
http://www.nceas.ucsb.edu/    Ph: 805-893-5127
National Center for Ecological Analysis and Synthesis (NCEAS) 
Marine Science Building - Room 3405
Santa Barbara, CA 93195
*******************************************************************