Re: Average of Array?

Thanks Tom & Pavel, these are very helpful.

On Fri, Jun 25, 2010 at 12:29 PM, Pavel Stehule <pavel.stehule@gmail.com> wrote:
> Hello
>
> 2010/6/25 Lee Hachadoorian <lee.hachadoorian@gmail.com>:
>> Is there a function that returns the average of the elements of an
>> array? I'm thinking of something that would work like the avg()
>> aggregate function where it returns the average of all non-NULL
>> values. Can't find anything like it in the docs, and I'd like to make
>> sure I'm not missing something.
>
> it doesn't exists, but it is simple to develop it
>
> CREATE OR REPLACE FUNCTION array_avg(double precision[])
> RETURNS double precision AS $$
> SELECT avg(v) FROM unnest($1) g(v)
> $$ LANGUAGE sql;
>
> Regards
>
> Pavel Stehule
>
>>
>> Thanks,
>>
>> --
>> Lee Hachadoorian
>> PhD Student, Geography
>> Program in Earth & Environmental Sciences
>> CUNY Graduate Center
>>
>> --
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>



-- 
Lee Hachadoorian
PhD Student, Geography
Program in Earth & Environmental Sciences
CUNY Graduate Center