Re: Subsetting

Thank you very much Dennis,
Cheers

On Sun, Sep 23, 2012 at 4:31 PM, Dennis Shea <shea@ucar.edu> wrote:

> Please become familiar with the 'date' functions.
> http://www.ncl.ucar.edu/**Document/Functions/date.shtml<http://www.ncl.ucar.edu/Document/Functions/date.shtml>
>
> Specifically, cd_calendar and the options
>
> f = addfile("...", "r)
> ; ALL times on file
> TIME = f->time
> YYYYMM = cd_calendar(TIME, -1) ; convert
>
> ymStrt = 190801 ; year-month start
> ymLast = 200712 ; year-month last
>
> iStrt = ind(ymStrt.eq.YYYYMM) ; index of start time
> iLast = ind(ymStrt.eq.YYYYMM) ; last time
> x = f->X(iStrt:iLast,...) ; read only specified time period
>
>
>
> On 9/23/12 5:08 PM, Almami Johnson wrote:
>
>> Dear all,
>>
>> I need to take a common time range (say 1985-2000) while manipulating
>> many netcdf files with different time range. I'm just wondering if it is
>> possible to take a subset of the data along the time dimension by
>> providing the actual dates rather than the timesteps. For example
>> rather than doing:
>>
>> in = addfile("UDEL_1900_2010_v301.**nc","r")
>> pre = in->precip({1020:1331},:,:)
>>
>> which requires you know the exact time step representing 198501 and
>> 200012, I would like to input directly the actual date when doing
>> pre = in->precip(date_start:date_**end},:,:).
>>
>> Is there a way to do it such that NCL will undertand it?
>>
>> Thanks.
>> Almami
>>
>>
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Received on Sun Sep 23 17:44:10 2012