for your info: ch. 11 mbe: fast fourier transforms

Hi again,

I should have suggested, in my last reply, that I would be
available and eager to test your beta version of a new
fft and ift etc , which would also let me integrate my
package qfft.mac with the new versions.

So if you could give me a link, etc...when  such beta
becomes available.

Also, the last example of Ch. 11, Cleaning a Noisy Signal
with FFT Methods,  failed to define tmax and psize,
 so the last two lines of that example *should*
look like:

(%i25) (tmax:2, psize:2)$
(%i26) sample_plot (e,t,tmax,-2,2,flist_clean, dt, psize)$

I have updated my webpage files mbe11fft.pdf and
mbe11code.txt (dated may 2) to reflect this correct code.

(Thanks to Luigi Marino for the code error feedback.)

Ted

----- Original Message ----- 
From: "Robert Dodier" <robert.dodier at gmail.com>
To: "Edwin Woollett" <woollett at charter.net>
Sent: Friday, May 01, 2009 10:21 AM
Subject: Re: for your info: ch. 11 mbe: fast fourier transforms


> On Wed, Apr 29, 2009 at 5:40 PM, Edwin Woollett <woollett at charter.net> 
> wrote:
>
>> You might be interested in my lastest tutorial
>> chapter on a list based approach to fast fourier
>> transforms, especially the function flines
>> which goes from the signal sample list
>> to a fft spectrum histogram in one step.
>
> Thanks, Ted. Actually I am working on an update for the existing
> fft package to make it more convenient to use.
> I am reworking it so that the arguments can be lists as well
> as arrays, and also so that there could be just one argument
> (from which the real and imaginary parts are extracted).
>
> Thanks for your interest in Maxima --- I think it's very useful
> to have a large collection of worked examples, as you have done.
>
> best
>
> Robert
>