Hi Dr. B and John,

I think that dam should be altered or fixed to operate correctly, as I
think it is faulty in its current form, and that this not just an
enhancement but a real fix.  I don't have the Csound book here with me
in Warsaw, but I would imagine that fixing the opcode and having the
original in the book won't diminish the pedagogical value of the book
version.  On the other hand, not fixing dam and introducing a dam2
means it'll live on forever broken, which doesn't seem to make much
sense.

Regarding the fix, perhaps we could do direct calculation but
depending on detection of threshold change, so perhaps adding a
previousThreshold and powerVal value to the struct and having code
like:

if(p->kthreshold != p->previousThreshold) {
  [calculate value]
}

Taking a quick look at the code just now I'm a bit lost still, but
maybe it'd be just better to calculate every time?

steven


On 2/19/07, Dr. Richard Boulanger <rboulanger@berklee.edu> wrote:
> If fixing it breaks the chapter in The Csound Book, maybe you could
> make a dam2 opcode that *fixes* *improves*  it.
>
> Rick
>
> On Feb 19, 2007, at 5:46 AM, jpff wrote:
>
> > I too thought that there was something odd; if the table depends on a
> > krate object then it needs to be recalculated whenever it changes.
> >   So I think i can to the same conclusion as you!  I do not really
> > understand the algorithm -- would remaking the table lead to
> > glitching?  If the opcode used with a constant krate object in which
> > case a table is cool.  If the normal use has a varying krate object
> > then direct calculation probably wins.
> >   The other point of this opcode is that is was written for the Csound
> > book as an example of how to write an opcode.  In fixing it we may
> > damage the book.
> >   Anyone have suggestions/advice?
> > ==John ffitch
> >
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