Hello,
I'm in the process of blind-cloning/porting parc (for monome/max) to pd (for livid block).
Picture an 8x8 grid, each row represents a note, each column represents a step.

When I have multiple rows selected on a step, I want pd to randomly choose a note from those steps (rather than playing a chord).

For this, I think I need to use [list] rather than [pack] or a [table], because it is dynamic. How can I choose a random element from a list, and how can I have a dynamic pack object?

For example, if I only have 4 notes selected on a step, I do not want to have [pack f f f f f f], but
[pack f f f f].

edit: by dynamic, I mean that it does not have a fixed length.

There are a host of objects in the list abs library that will help you with things like this. From memory, [list-seek] will probably fit well.

Another option is [zl nth] which selects the nth term of a list. This will require slightly more work than [list-seek], as you need to send the list to the hot inlet rather than the cold, but technically it should work a bit faster as it is an external.

If I understand what you're trying to do, you can simply do this :

Thanks ya'll!

@LucienR That's exactly what I'm trying to do, but I just wrote a Lua external to do it right before I checked back here ^.^