Hey there,

as a beginner I am having trouble dealing with lists and accessing scalars within lists. Would be nice if you can point me in the right direction.

Background: I am using “netsend” to send data from a python code to pd. Within pd I want to store the messages which are being send. Essentially every message is referring to an “object”. A message contains five floats: e.x. “1 52 23 54 6”. The first float is the id of an object. The other floats are properties of the object.

Now when a message is send to pd I want my patch to:

• Check if the object is already stored in my list, in other words: If an object with the same Id exists in the list

• ... Yes -> change the properties of that object

• ... No -> add (“append”) the object to the list

• Delete an object if the message is “xx xx 0 xx xx”
  In future I’d like to use these objects to create sounds (duh), similar to a sequencer as presented in the Help Browser
  -> pure Data/ -> 4.data.structures/ -> 07.sequencer.

Thanks for taking the time!

Daniel

@Dannielo Hi, I've never delved into data structures myself but I think what you have described could be done with the [text] objects.

@Dannielo something like this cold be helpful to get you going:

text.storage.pd :

there are also objects [text delete] and [text sequence] whose help patches might be helpful to figure out how to implement what you need.

@weightless
this is also with text delete
list_store.pd

@ingox very nice! I must say I'm still quite new to these text objects, but they do seem very powerful indeed.

@weightless yes, they are very nice

@Dannielo It was easy in "extended" (like so much).
[iem_pbank_csv] from the iemlib library. If you are using extended, or if you can install that library in vanilla, it will do the whole job, except for the "0" delete.
No need to prepend [pp] a line number as you have that already set (your "id").

"Change" and "add" would be the same operation (i.e. always change the line by id).
The delete could be dealt with by ignoring any returned data with the second parameter = 0. (id p1 p2 p3 p4).

David.

Ok, wow. I will have to wrap my head around your ideas since this style of programming is totally new to me. Anyway, thanks alot for your time and solutions.
This is really helping me out.