[PD] Binary - integer conversion

[padawan12]

On Fri, 16 Mar 2007 13:18:12 -0600
"David Powers" <cyborgk at gmail.com> wrote:

> Wow I thought for sure this would be built in ... or at least a common
> external.

It possibly is. I'm just showing you how to do it from scratch in a way
that directly follows the algorithm Kyle pointed you at.

You could use << and >> to rotate your numbers, and other ways to do it
differently. Making it extensible/flexible so that you can work on
8, 16, 32 or bigger rythmns is an important consideration, and you
usualy end up using lists to do that or adopt a fixed width approach.

> I guess speed is the issue here for me, rather than the ability to
> convert per se. 

The binary representation of beats has come up before, several times and
although it is seductive as an apparently efficient data structure it
has a bunch of its own pitfalls and weaknesses that I'm sure you will have
fun discovering :) As for speed, I don't think the conversion stage is 
where you will gain much opimisation anyway if your premise is to save 
cycles by doing bitwise transformations on integers.

> This would be a good reason to write my first external
> I guess.

Yes it would be a good task to do. It's quite trivial
in C. You could make a simple and general [bit n] 
that returns the nth bit of a decimal int on its
left inlet. To do it properly and make it maintainable
perhaps some arguments for byte/word size and endiness
would help.

> 
> ~David
> 
> On 3/16/07, Kyle Klipowicz <kyleklip at gmail.com> wrote:
> > You must implement the algorithm shown in this link:
> >
> > http://en.wikipedia.org/wiki/Binary_numeral_system#Decimal
> >
> > I did that in C during that earlier mentioned summer of my K&R C
> > binge. I'm not sure how tricky it would be to do in Pd.
> >
> > ~Kyle
> >
> > On 3/16/07, David Powers <cyborgk at gmail.com> wrote:
> > > Hi, sorry I do know that, but it's not my question.
> > >
> > > In order to use the bitwise operators, I think I need to convert an
> > > arbitrary string of 0's and 1's, say "00010101", into an integer, in
> > > this case I think 21. Is that more clear?
> > >
> > > Thanks,
> > > David
> > >
> > > On 3/16/07, Steffen <stffn at dibidut.dk> wrote:
> > > >
> > > > On 16/03/2007, at 18.44, David Powers wrote:
> > > >
> > > > > Hello,
> > > > >
> > > > > Is it possible to somehow convert back and forth between integer and
> > > > > binary in PD?
> > > > >
> > > > > My idea, is to represent simple drum machine style rhythms as binary
> > > > > numbers. [101010001011]. Ok, so if this were a float, it would be
> > > > > trivial to do a common task and shift the rhythm left or right. I
> > > > > think, that other rhythmic variations would also be quite fast to
> > > > > implement using this system, you can do binary math instead of list
> > > > > operations which should be much faster, I assume.
> > > >
> > > >
> > > > I think you want to have a look at the bitwice operators &,&&,|,||,<<
> > > > and >>. See also http://en.wikipedia.org/wiki/Bitwise_operation
> > > >
> > > > Hope this helps.
> > > >
> > >
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