Re: How do the "climatology functions" treat missing values?

From: Dennis Shea <shea_at_nyahnyahspammersnyahnyah>
Date: Sat Jan 22 2011 - 13:39:42 MST

If the missing value, denoted by the _FillValue attribute,
is present then NCL will add the Jan 2002,2003,2004,2005
values and divide by 4

On 1/22/11 12:56 PM, eddycarl wrote:
> Hi there,
> I have a question about the use of the "climatology" functions (such as
> calcMonAnomTLL, reMonAnnCycTLL and clmMonTLL). They do require that the
> time dimension of the input data MUST be a multiple of 12. But I am
> wondering how these functions treat the missing values?
> Let's take an example. Assuming that we have a temperature data
> TEMPT1(time, lat, lon) with time range from March 2001 to December 2005
> (a total of 58 months). In order to use the above functions, we generate
> a new array TEMPT2(time, lat, lon) ranging from Jan. 2001 to Dec. 2005
> (a total of 60 months), with the first two months (Jan. 2001 and Feb.
> 2001) setting as all missing values, and the following months as the
> same with TEMPT1. In this way, we can use the above functions. But my
> question is that how the functions like clmMonTLL treat those missing
> values? Or, is this the correct way to do the problem when we do not
> have an exact number of months (which should be a multiple of 12) for
> the function?
> Thanks,
> -Eddy
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Received on Sat Jan 22 13:39:50 2011

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