- From: Andy Seaborne <andy.seaborne@epimorphics.com>
- Date: Mon, 20 Sep 2010 14:23:33 +0100
- To: Axel Polleres <axel.polleres@deri.org>
- CC: SPARQL Working Group <public-rdf-dawg@w3.org>
On 20/09/10 11:30, Axel Polleres wrote:
>> > Just define:
>> > Sum(S) = op:numeric-add(S0, Sum(S1..n)) when|S| > 1 if S0 is a number
>> > Sum(S) = op:numeric-add(0, Sum(S1..n)) when|S| > 1 if S0 is not a number
> is not as straightforward as Flatten op:numeric-add, but could be an option.
>
I don't understand that. The flatten operation is independent of the
specific aggregation - it doesn't remove non-numbers:
[[
Definition: Flatten
The Flatten(M) function takes a multiset of lists, M {(L1, L2, ...),
...}, and returns the multiset given by the multiset union of { Li | L
in M } for all i in L.
]]
Could be changed to take a condition on the members produced.
Avg() works if Sum() does.
Andy
Received on Monday, 20 September 2010 13:24:14 UTC