[PD] note data record / playback

[Kyle Klipowicz]

And also, can an array be a valid ds entry (i.e. [struct ds array fft
aray sigblock])?  That would be awesome, if it was efficient and
quick!

~Kyle

On 9/12/06, Kyle Klipowicz <kyleklip at gmail.com> wrote:
> 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__
> > >
> > > _______________________________________________
> > > PD-list at iem.at mailing list
> > > UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
> > >
> >
> > _______________________________________________
> > PD-list at iem.at mailing list
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> >
>
>
> --
>
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(((())))(()()((((((((()())))()(((((((())()()())())))
(())))))(()))))))))))))(((((((((((()()))))))))((())))
))(((((((((((())))())))))))))))))))__________
_____())))))(((((((((((((()))))))))))_______
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