[ncl-talk] eof script problems

[Dennis Shea]

Sometimes, when people answer, they are quickly typing and make errors.

Will had a typo. He meant 'ispan' .....
This is one of the most basic functions in NCL. Please read documentation:
       https://www.ncl.ucar.edu/Document/Functions/Built-in/ispan.shtml

year = ispan(yrst, yren,1)               ; integer array of all years in
the range





On Thu, Aug 14, 2014 at 6:29 AM, James Ciarlo` <james.ciarlo at physics.org>
wrote:

> Hi Will,
>
> Thanks for your help. However, the span command was not recognized.
>
> Regards,
> James
>
>
> On 14 August 2014 09:08, Will Hobbs <Will.Hobbs at utas.edu.au> wrote:
>
>>  James
>>
>>  As the name of function might suggest month_to_season() is designed to
>> convert monthly data to seasonal data; it's not designed to work with
>> 4xtimes daily data. If in doubt about any function, your first step should
>> ALWAYS be to consult the NCL help page for that function (
>> http://www.ncl.ucar.edu/Document/Functions/Contributed/month_to_season.shtml
>> )
>>
>>  There is a page listing all of NCL's functions:
>> http://www.ncl.ucar.edu/Document/Functions/climo.shtml, at the moment
>> they only work with monthly or daily data, so you will have to use a
>> different approach.
>>
>>  My advise would be to use one of NCL's date functions (
>> http://www.ncl.ucar.edu/Document/Functions/date.shtml) to find all the
>> data points for a given season. I've given an example below to calculate
>> the seasonal mean for Jan-Mar (JFM), whcih you can adjust to your own
>> purposes. This assumes that your data has an appropriate time coord system,
>> which I'm calling 'time' here. Lt's say you have an array, x, dimensioned
>> (time,lat,lon)
>>
>>  > nyr    = yren - yrst+1   ;yrst and yren are the forst and last years
>> in x
>> > xSeas = x(:nyr-1,:,:)  ; nyr is the number of years in your data set
>> >year = span(yrst, yren,1)               ; integer array of all years in
>> the range
>> > tdat = cd_calendar(x&time, -5)  ; converts time to a multidimensional
>> array giving year, month, day, time etc for each time step
>>
>>  > do yy = 0, nyr-1
>> >      ii =
>> ind(tdat(:,0).eq.year(yy).and.tdat(:,1).ge.1.and.tdat(:,1).le.3)  ;location
>> of all times in given year, that are between Jan (1) and March(3)
>> >     xSeas(yy,:,:) = dim_avg_n(x(ii,:,:), 0)    ; get average of all
>> those data points
>> >    delete(ii)
>> > end do
>>
>>
>>  Hope that helps. Don't forget that there is an enormous amount of help
>> to be gained by on the NCL website; it has a search function which includes
>> archived 'ncl-talk' posts. Nine times out of ten somebody else will have
>> come across the same problem.
>>
>>  Will
>>
>>
>>
>>
>>   From: James Ciarlo` <james.ciarlo at physics.org>
>> Date: Thursday, 14 August 2014 4:43 PM
>> To: "ncl-talk at ucar.edu" <ncl-talk at ucar.edu>
>> Subject: [ncl-talk] eof script problems
>>
>>   Dear NCL users,
>>
>>  I am new to NCL and am trying to modify an eof script to suit a
>> different dataset.
>>
>>  The data the script is designed for uses a command month_to_season but
>> since my data is not monthly but rather 4 time daily, I need an alternative
>> method. And in fact running the script gives me the following error (to
>> start with, as I am sure fixing this will result in numerous other errors
>> later but lets start with this)
>>
>>  (0)     contributed.ncl: month_to_season: dimension must be a multiple
>> of 12
>>
>>  Regards,
>> James
>>
>
>
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