Shhh. I see you are right. Chemistry is not quit manhattan. An the general norms we have are in the matrix package, not the recommendation stuff.
On Saturday, January 1, 2011, Sean Owen <[email protected]> wrote: > I don't see them, no, unless I'm misunderstanding something. We have > cosine, mahalanobis, tanimoto, Euclidean, Manhattan, and some variants > like squared and weighted. I think these additions are fine? > > On Fri, Dec 31, 2010 at 11:51 PM, Ted Dunning <[email protected]> wrote: >> Don't we have both of these already under different names? >> >> >> On Friday, December 31, 2010, Lance Norskog (JIRA) <[email protected]> wrote: >>> Minkowski and Chebyshev DistanceMeasure >>> --------------------------------------- >>> >>> Key: MAHOUT-571 >>> URL: https://issues.apache.org/jira/browse/MAHOUT-571 >>> Project: Mahout >>> Issue Type: New Feature >>> Components: Math >>> Reporter: Lance Norskog >>> Priority: Minor >>> Attachments: MAHOUT-571.patch >>> >>> Implementations of Minkowski and Chebyshev distance measures. >>> Minkowski distance is a generalization of the L-space measures, where L1 is >>> Manhattan distance and L2 is Euclidean distance. Uses Math.pow to calculate >>> coordinate distances. Math.pow has a fast-path for integer-valued >>> arguments, so Minkowski with 3.0 is much faster than Minkowski with 3.1. >>> >>> Chebyshev distance is "chessboard" distance, based on the moves that a king >>> can make: any direction include diagonals. The Manhattan or taxicab >>> distances can only traverse in right angles. >>> >>> -- >>> This message is automatically generated by JIRA. >>> - >>> You can reply to this email to add a comment to the issue online. >>> >>> >> >
