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

[Bertram Ludaescher]

Great thanks! 

Bertram

Edward A. Lee writes:
 > 
 > Thanks to Mary Stewart, this paper is now on the web:
 > 
 > http://ptolemy.eecs.berkeley.edu/publications/papers/88/recurrencesVLSI-III/
 > 
 > Edward
 > 
 > At 06:01 PM 7/7/2005 +0200, 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
 > 
 > ------------
 > 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