Last year we wrote a multi-dimensional index for floats, similar in principle to the timeline index, but working on multiple floats (and doubles). We used it to index locations. Now we are hoping to include the same concepts in the new Neo4j Spatial<http://wiki.neo4j.org/content/Neo4j_Spatial>project. Even though this is targeting map data, it seems viable for any float/double property index. We hope to have some usable code for this within the next few weeks.
On Mon, Mar 22, 2010 at 10:13 PM, Rick Bullotta < [email protected]> wrote: > Alex, due to floating point precision issues, you might be best off > determining some type of integral rounded or scaled key as you suggest. If > you end up using the Lucene indexing engine, you'd probably want to do > something like this anyway, since indexing is string-based under the hood. > > That said, I wonder if any of the graph algos available for Neo could be > used to determine centrality during traversal rather than storing it > statically? > > -----Original Message----- > From: [email protected] [mailto:[email protected]] > On > Behalf Of Alex D'Amour > Sent: Monday, March 22, 2010 5:06 PM > To: Neo user discussions > Subject: [Neo] Indexing on Doubles in Neo4j > > Hello all, > > I'm working on an application where it would be nice to perform lookups on > a > graph database based on real-valued properties. > > For example, if I have a social network, and have assigned real-valued > centrality measures to each node, I'd like to be able to choose all > vertices > whose centrality measure is greater than some threshold. > > I see that the Timeline index service offers this for integer-valued > properties. Is there something similar (or in the pipeline) for doing the > same with real-valued properties? Is there an easy way to adapt one of the > current indexing utilities to do this (besides multiplying by 10^n for > sufficiently large n and then rounding)? > > Thanks, > Alex D'Amour > Harvard Institute for Quantitative Social Science > _______________________________________________ > Neo mailing list > [email protected] > https://lists.neo4j.org/mailman/listinfo/user > > _______________________________________________ > Neo mailing list > [email protected] > https://lists.neo4j.org/mailman/listinfo/user > _______________________________________________ Neo mailing list [email protected] https://lists.neo4j.org/mailman/listinfo/user
