RE: [Audacity-nyquist] snd-average does not work

[Roger D. <rb...@cs...>]

I think you are passing a stereo sound (an array of two values of type
SOUND) to snd-avg, which requires a SOUND. You can test for multichannel
sounds with TYPE-OF and use (AREF s 0) and (AREF s 1) to get the left and
right channels. VECTOR can be used to construct a multichannel sound from
two (or more) SOUNDs. -Roger

 

 

  _____  

From: aud...@li...
[mailto:aud...@li...] On Behalf Of Faisal
...
Sent: Tuesday, January 10, 2006 4:32 PM
To: aud...@li...
Subject: Re: [Audacity-nyquist] snd-average does not work

 

Hello Alex

 

I tried but I am still getting the same message for the plugin.  By
following your instruction for the prompt, I am now getting the same error
as for the plugin.

 

I hope that I am not such a pain but could it be the version of Nyquist or
Audacity?

 

On 1/10/06, Alex S. Brown <ale...@al...> wrote: 

You are almost there. Lisp needs parenthesis around functions and their
arguments. Replace this line:
snd-avg s blk blk OP-AVERAGE

with this one:
(snd-avg s blk blk OP-AVERAGE)

and you should be on your way!

Likewise, when you put the command in at the Nyquist prompt with no
parenthesis
(like this: "snd-avg s 213 213 OP-AVERAGE"), Nyquist assumes that snd-avg is
a 
variable, and you want to output its result. Since no such variable has been
defined, it errors out.

If you add the parenthesis (like this: "(snd-avg s 213 213 OP-AVERAGE)"),
Nyquist will look for a function named "snd-avg" and will pass the four 
arguments into it (s, 213, 213, and OP-AVERAGE). This is what you want -- it
should work.

--Alex

P.S. If you have programmed in other languages like BASIC or C, lisp takes a
lot
of getting used to. Parentheses have a totally different purpose than in any

other language I have seen, and they are the key to getting it right. If I
see
something erroring out because of an unbound variable or invalid function,
the
first thing I look for is bad parentheses, especially unmatched parentheses.


Quoting "Faisal ..." <fmo...@gm...>:

> Hello Listers
>
> Thanks for your feedback so far but I am still having problems. I am using

> Audacity 1.2.3 build 17-Nov-2004, forgot to mention in previous email.
>
> When I type the following in the Nyquist Prompt:
> snd-avg s 213 213 OP-AVERAGE
>
> This is what I get:
>
> *error: unbound variable - SND-AVG
> if continued: try evaluating symbol again
> 1> #(#<Sound: #27523a0> #<Sound: #2752628>)
> 1> 213
> 1> 213
> 1> 1
> 1> [ gc: total 18640, 3675 free; samples 1KB, 0KB free ]* 
>
> And I could not debug my plugin so I modified it slightly so that I can do
> so.
> Here is the code:
>
>
> *;nyquist plug-in
> ;version 1
> ;type process
> ;name "sound averager" 
> ;action "sound averager"
> ;info "By Faisal Mooraby"
> ;control blk "Block Size" real "" 100.0 0.0 10000.0
> ;; Note: this effect will use up memory proportional to 
> ;; delay * count, since that many samples must be buffered
> ;; before the first block is freed.*
>
> *snd-avg s blk blk OP-AVERAGE
> *
>
> and that's what I get from the debuging output: 
>
> *error: bad argument type - #(#<Sound: #27523a0> #<Sound: #2752628>)
> Function: #<Subr-SND-AVG: #f11970>
> Arguments:
>   #(#<Sound: #27523a0> #<Sound: #2752628>) 
>   213
>   213
>   1
> 1> [ gc: total 18640, 3674 free; samples 1KB, 0KB free ]
> *
> Again, I appreciate your help.
>
> Faisal Mooraby

----------------------
Alex S. Brown, PMP
ale...@al...
http://www.alexsbrown.com/


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-- 
Faisal Mooraby