R devel - Dec 1997 - R-alpha: fft does not act as described in help(fft)

Hello!

thank you for your efforts creating R!

While preparing the next lessons I found that I had
to multiply with 1/length(x) by hand if I want to 
get the inverse Fouriertransform.

The help states it will do it by itself.

Version R-0.60.1, Linux

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

Cu Detlef


Detlef Steuer Universitaet Dortmund	                	///////
LS Computergestuetzte Statistik         		 U N I D O ///  
steuer@gigamain.statistik.uni-dortmund.de         	______///////  
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>>>>>  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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