[ncl-talk] eof script problems

[Dennis Shea]

Ditto what Will has stated.

 NCL has many functions. Look-at/Search the function page. Examine both the
'Alphabetical' and 'Category'. Become familiar with it.
If you did a search for  (say) 'month' you would find functions that do
things with or calculate monthly quantities. You may even find

https://www.ncl.ucar.edu/Document/Functions/Contributed/calculate_monthly_values.shtml

It is the user responsibility to read the documentation carefully.

===
If you are new to NCL:

[1] Please read the "Mini-Language Manual" at:
https://www.ncl.ucar.edu/Document/Manuals/

[2] Become familiar with the Examples page(s)

[3] Use printVarSummary(...) frequently when developing code.

Good Luck


On Thu, Aug 14, 2014 at 1:08 AM, 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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