From Martin Maechler <maechler@stat.math.ethz.ch>  Thu Dec 11 17:56:31 1997
From: Martin Maechler <maechler@stat.math.ethz.ch> (Martin Maechler)
Date: Thu, 11 Dec 1997 18:56:31 +0100
Subject: R-alpha: fft does not act as described in help(fft)
In-Reply-To: <XFMail.971211112706.steuer@gigamain.statistik.uni-dortmund.de>
 (message from Detlef Steuer on Thu, 11 Dec 1997 11:21:09 +0100 (MET))
Message-ID: <199712111756.SAA05761@sophie.ethz.ch>

>>>>>  Detlef Steuer <steuer@gigamain.Statistik.Uni-Dortmund.DE> writes:

    Detlef> Hello!  thank you for your efforts creating R!

Thank you for reporting the inaccuracy!

Please ``R-develer''s,  keep these reports flowing..!

    Detlef> While preparing the next lessons
(which lessons? -- I am curious)
    Detlef> I found that I had to multiply
    Detlef> with 1/length(x) by hand if I want to get the inverse
    Detlef> Fouriertransform.

    Detlef> The help states it will do it by itself.

    Detlef> Seems to be pretty easy to correct either the fft or :-) the
    Detlef> help(fft)!

I corrected the  help(fft).  It is now clear about NOT dividing and
gives an example showing how the inverse is got from ``inverse = TRUE''

The current behavior is the same as S, 
and we do want this in these basic things.

Martin Maechler <maechler@stat.math.ethz.ch>		 <><
Seminar fuer Statistik, SOL G1
ETH (Federal Inst. Technology)	8092 Zurich	 SWITZERLAND
phone: x-41-1-632-3408		fax: ...-1086
http://www.stat.math.ethz.ch/~maechler/
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R-alpha: fft does not act as described in help(fft)
Martin Maechler