At 05:53 AM 6/3/2004, Philippe.Dumont wrote:
Stephen Andrew Neuendorffer wrote:
I'm a bit at a loss as to why it must execute N1 times? In seems to me
like the N1 firings of HT1 and the N2 firings of HT2 could be hidden
inside the
actor, but without more information about where the desired number of
firings is coming
from, I couldn't hazard a guess as to the right way to represent it.
The N1 firings of HT1 and the N2 firings of HT2 could be hidden inside
I do agree with you, but I don't know how to proceed...
In fact in our model, there are two levels :
The first is the one I described in my last mail.
Each HT (Hierarchical Task), contains the second level :
When I take an input token, I cut it in N parts, I do a computation on
each part. At the end I take the N results of the computation
and I produce the result token. So I use N firings to do the N
computations. I don't have the choice
because I need to increment a counter in the firing method of the director.
OK, so I see two ways to approach this:
1) represent the extraction and composition of the N parts explicitly.
2) have it happen implicitly.
I'm not sure what you are interested in:
1) is pretty straightforward (use an ArrayToSequence to
extract the N tokens, send them through an actor, and then use a
Downsampler to
discard all but the last output)
2) I could picture doing a couple of ways, depending on how you are
representing the primitive operation
and what is important about it. The Director.transferInputs and
transferOutputs methods could be overridden
to do what you want to do. The primary downside to this is that you end up
with an extra layer of hieararchy.
The IterateOverArray actor (actor.lib.hoc) implements one way of hiding the
extra hierarchy in the user interface.
It overrides the director to behave as a ArrayToSequence, followed by an
actor, followed by SequenceToArray
It sounds like you want something similar, but with a DownSampler instead
of a SequenceToArray.
The director is an SDF director.
I try to use the iterate method but i don't know how to use it properly.
I can't use the preinitialize or initialize method because all the
methods preinitialize or initialize of all the HT must be executed
before a fire.
I would like to call it between initialize and prefire. I think it's
the best solution. But I do not know if it is possible ?
I don't understand what you are trying to do here...
Steve
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