de.lmu.ifi.dbs.elki.distance.distancefunction

Interface DBIDDistanceFunction<D extends Distance<?>>

Type Parameters:

D - Distance type

All Superinterfaces:

DistanceFunction<DBID,D>, Parameterizable

All Known Implementing Classes:

AbstractDBIDDistanceFunction, DiskCacheBasedDoubleDistanceFunction, DiskCacheBasedFloatDistanceFunction, FileBasedDoubleDistanceFunction, FileBasedFloatDistanceFunction, ProxyDistanceFunction, RandomStableDistanceFunction

public interface DBIDDistanceFunction<D extends Distance<?>>
extends DistanceFunction<DBID,D>

Distance functions valid in a database context only (i.e. for DBIDs) For any "distance" that cannot be computed for arbitrary objects, only those that exist in the database and referenced by their ID. Example: external precomputed distances

Method Summary

Methods

Modifier and Type	Method and Description
D	distance(DBIDRef id1, DBIDRef id2) Returns the distance between the two objects specified by their object ids.

Methods inherited from interface de.lmu.ifi.dbs.elki.distance.distancefunction.DistanceFunction

getDistanceFactory, getInputTypeRestriction, instantiate, isMetric, isSymmetric

Method Detail

distance

D distance(DBIDRef id1,
         DBIDRef id2)

Returns the distance between the two objects specified by their object ids.

Parameters:

id1 - first object id

id2 - second object id

Returns:

the distance between the two objects specified by their object ids