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