Re: cross-corelation coherence

I think, it's still difficultto use "ezfftf" in this case, since this
method needs to find a coherence (based on "le Fourier coefficient")

  ==> let's say for k=1 --> Cohr= (CO^2 + QD^2) ^1/2

is it possible to use "specxy_anal" in this case,, however I have no idea
to retain a specific wavenumber in this case.

Xi

On Tue, Oct 29, 2013 at 3:22 PM, Dennis Shea <shea@ucar.edu> wrote:

> To my knowledge, this has not been done. Pretty specialized!
>
> Use ezfftf to perform the Fourier analysis at each
> time, level and latitude. This will provide the Fourier coefficients
> [his S1(t) and C1(t)]. You specify the desired wave number, k.
>
> http://www.ncl.ucar.edu/**Document/Functions/Built-in/**ezfftf.shtml<http://www.ncl.ucar.edu/Document/Functions/Built-in/ezfftf.shtml>
>
>
> On 10/29/13 7:13 AM, Xi Chang wrote:
>
>> Hallo NCL folks,
>>
>> Anyone here has ever used the cross-spectral correlation or cross
>> corelation coherence (Randel 1987) using NCL? maybe you could share the
>> main idea/function underlying this diagnostic tool?
>>
>> Thanks,
>> Xi
>>
>>
>>
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Received on Tue Oct 29 09:18:22 2013