[PD] List with variable number of floats

tim vets timvets at gmail.com
Tue Aug 17 18:41:50 CEST 2010

i mean 'tabdump' not 'tabdumB' :)

2010/8/17 tim vets <timvets at gmail.com>

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