Help:question about wavelet

Hi everybody,

I was trying to use the wavelet package and I found some dificulties, as for
example to understand why in the given example the Y-axis of the first and
second plot are different. I used other data and in general numeric values
of the y-axis of the second picture are different from the first.

I also notice that the lag1 used to determine the theoretical rednoise is
not a parameter, as it is not given as an argument, so I wonder what is the
lag1 used in the NCL wavelet package?

Another think that I would like to use is cross wavelet analysis, but I
don´t know is it is implemented yet.

And my last question, is there any way to see the source codes of the
functions implemented in ncl?, as for example: wavelet, specx_anal, ....?

Thank you a lot!
Enver

On 7/8/07, Dennis Shea <shea_at_ucar.edu> wrote:
>
> On Sat, 7 Jul 2007, lxf wrote:
>
> > Hi,
> > Today when I try to use function "wavelet" of NCL to do averaging in
> scale , I found in the origin fortran program ( download from
> http://atoc.colorado.edu/research/wavelets/software.html) there is a
> option selettion of "isigtest =2 " to do "scale-average" test.However ,
> NCL function (
> http://www.ncl.ucar.edu/Document/Functions/Built-in/wavelet.shtml) only
> have two option selection :
> >
> > "isigtest
> > A value of 0 means do a regular chi-square test, i.e. Eqn (18) from
> Torrence and Compo. A value of 1 means do a "time-average" test on the
> global wavelet spectrum. "
> >
> > Then I want to know if I can use the NCL funtion to
> do "scale-average" and the test of "scale-average".
> > _______________________________________________
> Sorry no. I f you tried isigtest=2 you should get:
>
> warning:wavelet: Only isigtest = 0 or 1 has been implemented. Defaulting
> to 0
>
>
> cwHopefully, I will have time to make it available for the next release of
> NCL.
>
> D
>
>
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> ncl-talk_at_ucar.edu
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>

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Received on Tue Jul 17 2007 - 15:25:46 MDT