[PD] note data record / playback

[Kyle Klipowicz]

>From what I understand, a "scalar" in DS lingo is really a
multi-variable, which is turned into a multidimensional array using
the pointer as an index.  Is this even half-right?

What I don't understand is why there is a completely different atom,
pointer, to index the datastructures.  Why not just use an integer?
Is it faster?

~Kyle

On 9/12/06, David Powers <cyborgk at gmail.com> wrote:
> Okay, I did try to go through most of your tutorial, but for some
> reason the post below seems much clearer. Just what I needed, thanks.
>
> Hopefully I can make more sense of things from here.
>
> ~David
>
> On 9/12/06, Frank Barknecht <fbar at footils.org> wrote:
> > Hallo,
> > David Powers hat gesagt: // David Powers wrote:
> >
> > > I'm sure that's true, but I'm I had problems understanding the
> > > existing data structure tutorials. Just the definition of the term
> > > "scalar" confused me, for starters. It's not even entirely clear, from
> > > the tutorials, that structures might be useful, if you don't care
> > > about the graphic part. For some reason, the struct in C makes much
> > > more sense. Probably it's just some new terminology that I don't
> > > recognize.
> >
> > hm, did you read this:
> > http://puredata.info/community/projects/convention04/lectures/tk-barknecht/tut.tgz
> >
> > It's trying to explain all this stuff in very small steps, and
> > reportedly people seem to get along with it quite well. There also is
> > a pdf on puredata.info, but I don't have URL availabl atm. Check the
> > archives.
> >
> > Regarding the sequencer-example: I admit it's not documented, but it's
> > kind of too advanced anyways if you didn't yet do or understand the
> > basics tutorial.
> >
> > But to give a broad overview: In your array-based approach you have
> > different arrays for different needs: One to store time stamps,
> > another to store note value etc.
> >
> > timestamp [table ts]: t0 t1 t2 ... tn
> > notes [table note]:   n0 n1 n2 ... nn
> > ...
> >
> > A data structure in Pd is similar to this, but it's like one column of
> > all these tables crammed into one single "thing":
> >
> > [struct ds float ts float note]
> >
> >       ts note
> >       |  |
> > ds 0: t0 n0 ...
> > ds 1: t1 n1 ...
> > ds 2: t2 n2 ...
> > ...
> > ds n: tn nn ...
> >
> >
> > You then use the [set] and [get] objects to access or change these
> > fields:
> >
> >
> >  1028
> >  |      60      pointer
> >  |      |       |
> >  [set ds ts note]
> >
> >  pointer
> >  |
> >  [get ds ts note]
> >  |      |
> >  |      60
> >  1028
> >
> >
> > The "pointer" in the graphic above is used to select a data structure
> > instance to work on with get or set. You may think of the pointer as
> > equivalent to the number you would use to index all the tables from
> > your table-based approach:
> >
> >  [struct ds float ts float note] <=>  [table ts], [table note]
> >  pointer                         <=>  [f]: index from 0, 1, 2, ... ,n
> >  get                             <=>  tabread
> >  set                             <=>  tabwrite
> >  "next"                          <=>  increment index: [+ 1]
> >  "traverse pd-data"              <=>  reset index to 0 and "set table"
> >                                       message for tabwrite/-read
> >
> > Whereas with tables you have lots of tables to store data, with data
> > structures, you have one definition (struct ...) and then one or more
> > subpatches to hold the actual data.
> >
> > So data structures can be seen as an extension of [table]. In fact,
> > they even share part of their implementation AFAIK. A [table] in Pd is
> > just a special kind of data structure that's predefined.
> >
> > Ciao
> > --
> >  Frank Barknecht                 _ ______footils.org_ __goto10.org__
> >
> > _______________________________________________
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> >
>
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