Re: Need a help for a logic of escorc

Hi Erika,

NCL has a correlation function that allows for lags:

<http://www.ncl.ucar.edu/Document/Functions/Built-in/esccr.shtml>

cheers, alessandra

On Aug 8, 2013, at 1:38 PM, Erika Folova <e.folova@gmail.com> wrote:

> So.. no suggestion for my case :-(
>
>
> On Sat, Jul 27, 2013 at 5:58 AM, Erika Folova <e.folova@gmail.com> wrote:
> Hallo NCL,
>
> Lately I am quite confused to set my code to do a cross correlation,
> The role is as follows: I have daily datasets lets say X and Y
> extending for 5 years. The role is, I want to keep 90-day time period for X "fixed" from
> 1 January to 31 March while the time series of the Y is shifted by -15 to 15 days (nlag= +/- 15 ). That means
> the Y time series start on 17 December and 15 January for the first and the last analysis.
>
> What I think is something like this:
>
> mxlag = 15
> lag = ispan(-mxlag,mxlag,1)
>
> do l = -mxlag,mxlag
> CC (l+mxlag,:) = escorc( X(time), Y(time|time+l))
> end do
>
> But I guess this is a wrong approach because I just want to concern on JFM fixed on X but shifted for Y as I mentioned previously,
> Any help would be really appreciated.
>
> Thank you
>
> Erika,
>
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Received on Thu Aug 8 11:42:22 2013