From: Xi Chang <xi.chang01_at_nyahnyahspammersnyahnyah>

Date: Wed Jan 23 2013 - 16:19:01 MST

Date: Wed Jan 23 2013 - 16:19:01 MST

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

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