Re: [Audacity-nyquist] dotimes - how does it work in plugins?

[<edg...@we...>]

Correction!

'dotimes' needs to know what value it shall return, otherwise it
returns NIL what ends up in Audacity with 'nyquist did not return
audio' or similar error messages.

(german error message: Nyquist gab keine Audiodaten zurück.)

> To apply the notch filter three times in a row you need to
> accumulate the returned sound in the 's' variable:

the correct version must be:

(dotimes (i 3 s) ; 's' is the return value of 'dotimes'
 (setf s (notch2 s (* (+ 1 i) 50) 1)))

The 'local variable' version works as-is because an explicit
return value was given:

(let (tmp-s)
  (dotimes (i 3) 
   (setf tmp-s (notch2 s (* (+ 1 i) 50) 1)))
  tmp-s) ; the return value

-  edgar



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