[Haskell-cafe] Animas/Yampa: ArrowChoice?

[Yves Parès]

> The Animas fork is something I did, to fix up some annoyances in
> Yampa. It's otherwise the same.

What are the annoyances you are talking about? Are you describing somewhere
why you needed to fork Yampa?
(Documentation maybe? I saw you added to Animas the documentation on the
functions that Yampa missed. )


2011/7/15 Edward Amsden <eca7215 at cs.rit.edu>

> On Fri, Jul 15, 2011 at 12:56 AM, Jason Dagit <dagitj at gmail.com> wrote:
> > On Thu, Jul 14, 2011 at 5:04 PM, Ertugrul Soeylemez <es at ertes.de> wrote:
> >> Hello all,
>
>
> >>
> >> I really like the way Animas (fork of Yampa) represents reactive
> >> systems, and I would love to write some of my simulations using it.
> Hi.
>
> The Animas fork is something I did, to fix up some annoyances in
> Yampa. It's otherwise the same.
>
> >> Unfortunately most of what I want to do requires dynamic systems, which
> >> can be boiled down to me believing to need an ArrowChoice instance for
> >> the SF arrow, because I have to choose between different signal paths
> >> depending on the input signal or events.
> >>
> >> Animas appears to be only suitable for robot-like systems with specific,
> >> predefined actors.
> >>
> >> Is there anything I can do about it?  Is it difficult to write the
> >> ArrowChoice instance?
>
> Recall that signals in Animas/Yampa are conceptually continuous, which
> means that an ArrowChoice instance would need to make a choice at
> every instant. This would expose the underlying sample rate. So, no,
> ArrowChoice doesn't conceptually fit in Animas/Yampa.
>
> >> Or is there a different solution, which I
> >> overlooked?
> > If I understand the thesis about the Frag game correctly it uses
> > rSwitch, or rpSwitch, to make a dynamic switch:
> > http://www.haskell.org/haskellwiki/Yampa/rSwitch
> > http://haskell.org/haskellwiki/Frag
> The switching combinators are the correct solution for dynamic systems.
>
> --
> Edward Amsden
> Student
> Computer Science
> Rochester Institute of Technology
> www.edwardamsden.com
>
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