# Re: Subsetting series of specific months out of YYYYMM data

From: Will Hobbs <Will.Hobbs_at_nyahnyahspammersnyahnyah>
Date: Wed Jan 30 2013 - 16:39:23 MST

Bronwen

Assuming you have an array x, dimensioned (time,lat,lon), where the time coord is an integer array of YYYYMM dates:

>yr = ispan(yrst, yren, 1) ; an integer array of all years in the series

> nyr = yren-yrst+1
>yrmon = new(nyr*3,"integer") ;an array which will hold the date of every month of interest

>yr = yr*100
>yrmon(::3) = yr +9 ; take any year (e.g. 1850), multiply by 100 (=185000) then add the month of interest (in this case September) = 185009 i.e. the YYYYMM date for all the septembers
>yrmon(1::3) = yr+10 ;October
>yrmon(2::3) = yr+11 ;November

>print(yrmon) ; yrmon should look something like (/185009,185010,185011, 185109 …../)

>xSeas = x({yrmon},:,:) ; select all months of interest from x

Will

From: Bronwen Konecky <bronwen_konecky@brown.edu<mailto:bronwen_konecky@brown.edu>>
Date: Thursday, 31 January 2013 10:27 AM
To: ncl-talk <ncl-talk@ucar.edu<mailto:ncl-talk@ucar.edu>>
Subject: Subsetting series of specific months out of YYYYMM data

Hello,

Apologies for a fairly novice question: I am trying to pull out months from a specific season from a file(time,lat,lon) that contains 130 years of monthly data (all months) in YYYYMM format (1560 time points). So I want a new file that contains e.g. months 9-11 from all years in the file (e.g. 187009, 187010, 187011, 187109, 187110, 187111, etc), for all lats and lons. I have tried various combinations of do loops and array selections using 'ind' but I think I must be missing something basic. Any advice?

Thank you!

-Bronwen

```--
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Bronwen Konecky, Ph.D. candidate
Dept. of Geological Sciences, Earth Systems History Group
Brown University
324 Brook St., Box 1846, Providence, RI 02912, USA
bronwen_konecky@brown.edu<mailto:bronwen_konecky@brown.edu>
cell +1-415-420-8083<tel:%2B1-415-420-8083>
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Received on Wed Jan 30 16:39:35 2013

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