[R] Plotting the complex fft in 3D?
maechler at stat.math.ethz.ch
Sat Sep 6 11:07:01 CEST 2008
Just another remakr on this thread.
I you have time series and think about its fourier transform
(EE language) then you should know that the statistical language
of that is "spectral analysis" or maybe
"frequency domain time-series analysis"
and the R function to consider should definitely be
spectrum() which is a wrapper (among others) to spec.pgram()
-- which calls fft() -- for computing the so-called
If you learn more about the topic, you will learn that in almost
all cases you'd consider a *smoothed* version of the
periodogram, etc etc (because the so-called *raw* periodgram is
*in*consistent as an estimate fo the underlying true spectrum).
The Time-Series chapter/section of the MASS book is very helpful
Martin Maechler, ETH Zurich
>>>>> "OB" == Oliver Bandel <oliver at first.in-berlin.de>
>>>>> on Thu, 4 Sep 2008 23:16:07 +0200 writes:
OB> Zitat von Duncan Murdoch <murdoch at stats.uwo.ca>:
>> On 04/09/2008 4:44 PM, Oliver Bandel wrote:
>> > Zitat von Duncan Murdoch <murdoch at stats.uwo.ca>:
>> >> Oliver Bandel wrote:
>> >>> Hello,
>> plot3d doesn't support that directly, but you could plot with
>> then use segments3d to add the lines.
>> > BTW: how to change the perspective? I did not found an
>> > angle-parameter for the plot3d()-function.
>> Just grab it with your mouse and drag.
OB> Wow, coool! :-)
OB> Well, rgl.... I think "gl" stands for OpenGl.
OB> Fine. :-)
>> will spin it, or par3d(userMatrix=rotationMatrix(...)) for a fixed
OB> Ok, some thinsg to play with.
OB> Thank you.
OB> R-help at r-project.org mailing list
OB> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
OB> and provide commented, minimal, self-contained, reproducible code.
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