Re: monthly mean climatology

Thank you for the hints. It worked fine but it just simply returned the
values from daily to monthly *not to monthly climatology*. If anyone has an
idea how to figure it out, i'll be really appreciate it.

Xi.

On Wed, Jan 23, 2013 at 10:22 AM, Dennis Shea <shea@ucar.edu> wrote:

> There are several approaches
>
> [1] http://www.ncl.ucar.edu/**Support/talk_archives/2012/**1256.html<http://www.ncl.ucar.edu/Support/talk_archives/2012/1256.html>
>
> [2] there is an unsupported and undocumented function in
> contributed.ncl: calculate_monthly_values
>
> It requires a time coordinate variable associated
> with the input variable 'x'. This time coordinate
> variable must be udunits compatible:
>
> "days since ...", "hours since ...", "seconds since ..."
>
> See cd_calendar and cd_inv_calendar
>
> ;-----------------------------**----
> ; undocumented and unsupported
> ;-----------------------------**----
> undef ("calculate_monthly_values")
> function calculate_monthly_values (x:numeric, arith:string,
> nDim[1]:integer, opt[1]:logical)
>
> ; calculate monthly values [avg, sum, min, max]
> ; x: numeric array of 5D or less [eg: time,lev,lat,lon]
> ; *must* have time coordinate recognized by cd_calendar
> ; if 5D [case,time,lev,lat,lon]
> ; arith: "avg" [also, "ave"], "sum","min","max" others may be added
> later
> ; nDim : scalar integer that specifies the 'time' dimension [generally, 0]
> ; opt : option ... not used here
> ;
> ; Sample usage: x(time,lat,lon) where time are n-hrly or daily values.
> ; xMonthAvg = calculate_monthly_values(x, "avg", 0, False)
> ; xMonthSum = calculate_monthly_values(x, "sum", 0, False)
> ; xMonthMin = calculate_monthly_values(x, "min", 0, False)
> ; xMonthMax = calculate_monthly_values(x, "max", 0, False)
> ;
> ; It is assumed that there will be multiple elements for the dim_avg_n
> ; calculation.
> ;
>
>
> On 1/22/13 4:32 PM, Xi Chang wrote:
>
>> Hallo NCL users,
>>
>> does anyone has a trick how to calculate monthly mean climatology from
>> daily dataset?
>>
>> Thank you for the help.
>>
>>
>>
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>>

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Received on Wed Jan 23 16:19:13 2013