I'm still not familiar with data structure and pointers in pd, but I think I'll
use your suggestion as a starting point. Thanks!
BEnoît
De : Frank Barknecht f...@footils.org
À : pd-list@iem.at
Envoyé le : samedi 17 mars 2012 11h49
Objet : Re: [PD] Re : store and manipulate multiple lists
Hi,
On Thu, Mar 15, 2012 at 11:39:51AM +, Andy Farnell wrote:
Yes of course. Once you can sort items of any type you can sort
aggregate items, structs, sublists or whatever on one of their
elements. Its a little messy in Pd. The best way might be to
use pointers and try to do the classic Kernighan and Richie
head swap thing but I have no idea how to exchange pointers in
Pd.
Sorting lists of numbers by their first element is pretty easy to do
with Pd's data structures/pointers. I don't have Pd at hand now to patch
an example (maybe Monday), but basically you first define a data
structure with one float x field and one with an array of these
float-items in addition to its own float x.
[pd $0-f]:
structure with one float item:
[struct $0-f float x]
[pd $0-record]:
structure with an x-float for sorting and the array data to hold
all the list items:
[struct $0-record float x array data $0-f]
Then you create the structured data from the lists and write them to a
subpatch as usual with data structures. The first element in an incoming
lists doubles as x position, the array holds the rest of the list.
[r one-list]
|
[t a a a]
| | |
| | [list split 1]
| | | ... traverse subpatch blabla
| | [append $0-record x]
| | |
| | [s $0-current-pointer]
| |
| [list length] [r $0-current-pointer]
| | |
| [setsize $0-record data]
|
[list-enumerate] - list-drip with index numbers, i.e. list a b - 0 a, 1
b
|
[swap] [r $0-current-pointer]
| \ |
[element $0-record data]
| \
[set $0-f x]
Then sorting is just a message sort to the subpatch receiver,
afterwards dump the lists again using basically the opposite from above.
You're only interested in the data array now.
Ciao
--
Frank
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