[PD] List with variable number of floats

tim vets timvets at gmail.com
Tue Aug 17 18:40:16 CEST 2010

see attachment
uses tabdumb and list-idx
chooses one of 18 'onn/off states' in a table randomly and flips it

2010/8/17 Frank Barknecht <fbar at footils.org>

> Hi João,
> On Tue, Aug 17, 2010 at 04:30:00PM +0100, João de Brito Rocha Reis Vidigal
> wrote:
> > Here's what I wanna do:
> >
> > I have 18 slot for audio and video to play. There can be one playing,
> none or even um to the 18.
> > These slots are to be triggered randomly.
> > Is there a possibility of storing the ID of the slots already triggered?
> Like a list? The thing is that if it is a list it would have to have a
> variable number of floats (wouldn't it?).
> > Why do I need this? Because after triggering a random slot ON I want to
> trigger a random slot OFF. So, I have to know what are the slots triggered
> on in order to trigger one of these OFF and not one 18. Otherwise I could
> end up triggering off a slot that was never on!
> > As well I need to know witch ones are OFF to randomly select and turn one
> on.
> A brute-force approach to your problem is attached: It uses [select] to
> re-trigger the random selection if you get a slot-value that already is
> off.
> If instead you get a usable slot-value, it stores this in a [f] object
> by using the cold, right inlet, so it can be switched off later, then
> also updates the [select] via its right inlet to watch for the new "ON"
> slot.
> There is a small risk to get a lot of the same values from [random] but
> this is very, very unlikely.
> You should remember the
>  [t f b]
>  \/
>  /\
>  [f ]
> idiom to delay the output of a float value by one execution step. It's
> often useful, and also the use of [select] to filter out unwanted
> values.
> You can also do all this without storing the OFF value by transferring
> the logic of switching off or on into your "slot" abstractions. The
> c_tgl.pd abstractions shows how to do that. It compares an incoming
> slot-number with [== $1] where $1 is the slot-id passed as argument. It
> has a global receiver in it to simplify patching a bit.
> Ciao
> --
> Frank
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