Re: two dimensional statistics in Postgres

Dne 6 Listopad 2014, 12:05, Gavin Flower napsal(a):
> On 06/11/14 23:57, Tomas Vondra wrote:
>> Dne 6 Listopad 2014, 11:50, Gavin Flower napsal(a):
>>> Could you store a 2 dimensional histogram in a one dimensional array:
>>> A[z] = value, where z = col * rowSize + row (zero starting index)?
>> How would that work for columns with different data types?
>>
>> Tomas
>>
> I implicitly assumed that all cells were the same size & type. However,
> I could devise a scheme to cope with columns of different types, given
> the relevant definitions - but this would obviously be more complicated.
>
> Also this method can be extended into higher dimensions.

Which is what I did in the "WIP: multivariate stats" ;-)

Tomas