[PD] add or subtract value every N ms?

Mathieu Bouchard matju at artengine.ca
Fri Jul 27 22:40:27 CEST 2007

On Fri, 27 Jul 2007, Frank Barknecht wrote:

> It's possible even simpler: Instead of a classical counter you can use 
> an accumulator, which is a similar idiom, but has [f ] and [+ ] 
> reversed: [+ ]x[f ]. Then you send the step size instead of a bang into 
> the [+].

Accumulator is the name I usually use for this, but in my other mail I 
call it "pre-incrementing" instead. This is a reference to C/C++ and 
old-style machine languages.

The name "C++" itself refers to post-incrementation, to signify that it is 
an "incremented" C, variable-wise. (value-wise, C+1 already does it)

The other incrementors of C/C++ (variable-wise) are pre-increments, in 
that the modification of the variable happens before the result is 
produced, and that result is produced from the new state of the variable. 
if I write ++C or C+=1 it's a post-increment.

In Pd, post-increment is done by using the output of a [f] variable, 
whereas pre-increment is done by using the output of the [+ 1] that goes 
back into the variable.

Actually it's possible also to output like a pre-increment but only put it 
in the variable when you are finished using it, by changing the wire 
order, but usually, this distinction does not matter.

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| Mathieu Bouchard - tél:+1.514.383.3801, Montréal QC Canada

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