# Re: Need a help for a logic of escorc

From: Erika Folova <e.folova_at_nyahnyahspammersnyahnyah>
Date: Fri Aug 09 2013 - 12:54:05 MDT

I meant as I described earlier, I want to keep 90-day time period for X
"fixed" from1 January to 31 March while the time series of the Y is shifted
by -15 to 15 days (nlag= +/- 15 ). That meansthe Y time series start on 17
December and 15 January for the first and the last analysis. I still do not
have an idea how to make it easily. Any help will be really appreciated.

Thank you,..

On Fri, Aug 9, 2013 at 2:42 AM, Alessandra Giannini <
alesall@iri.columbia.edu> wrote:

>
> 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 Fri Aug 9 12:54:14 2013

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