Re: Find and aggregate duplicates

Hi Slava,

You're right, there's no way to do this with a combination of built-in
functions. Dennis is creating an NCL script to do what you're
asking. I'm sure he'll send it along shortly.

--Mary

On Mon, 16 Mar 2009, Vladyslav Lyubartsev wrote:

> Hello,
>
>
>
> We have two huge arrays with the same dimension:
>
> Days = (/19950308,19950314,19950314,:,20081228,20081231,20081231/)
>
> Data = (/ 12.1, 22.5, 32.0, 12.8, 16.0, 32.1/)
>
> There can be several data values for the same day.
>
> Days are irregular. Sure we can sort them, however there will be gaps and
> duplicates in this array.
>
>
>
> Is it possible to carry out the following tasks efficiently, no loops, using
> only built-in NCL functions:
>
> 1) Construct the list of unique days, no duplicates
>
> 2) Calculate amount of duplicates for each unique day
>
> 3) Calculate the data average for each unique day
>
> I see no such solution, only loops.
>
> Am I right?
>
>
>
> Thanks,
>
> Slava
>
>
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Received on Tue Mar 17 2009 - 10:34:28 MDT