[PD] $n interpolation

Miller Puckette mpuckett at man104-1.ucsd.edu
Wed May 29 07:29:04 CEST 2002

hi Eli,

i don't think this is necessarily the best way to do it, but in Pd,
as in Max, $-variables only work when they appear at the beginning of
symbols, so that, for instance, $1$2$3 expands to "arg1$2$3" (if the first
arg is arg1), without expanding $2 etc. 

To do multidimensional expansion, for instance, instr1-voice2-yada,
make an "instr" abstraction and call it with "instr1".  inside the
abstraction, call a "voice" abstraction with $1-voice2" as argument.
inside the voice abstraction, use "$1-yada" which will then expand
to "instr1-voice2-yada".  Continue to any depth desired...


On Tue, May 28, 2002 at 09:49:01PM -0400, eli+ at gs211.sp.cs.cmu.edu wrote:
> Hello, all.  I've just started using pd, and haven't really gotten
> into the groove yet.  One question to start with... in an abstraction
> I tried to create "send $1-channel-$2", but it seems what this does is
> substitute for the $1 and leave the $2 a literal "$2".  Is this a bug
> or a feature, and does it have a workaround?
> More broadly: since this doesn't work, it must not be idiomatic pd.
> What's the usual way to do this kind of thing?  For context, I was
> building a little grid sequencer, where each cell has three parts: a
> "source" abstraction, a message box which the user edits, and a
> "sink", which handles the messages in various ways.  And when the sink
> saw a particular kind of message, it wanted to pass some data along to
> that "$1-channel-$2", where $1 is the name of the sequencer (to allow
> multiple ones) and $2 is the channel this cell is on.
> -- 
>      Eli Brandt  |  eli+ at cs.cmu.edu  |  http://www.cs.cmu.edu/~eli/

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