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

Interface DBIDDistanceFunction

All Superinterfaces:

DistanceFunction<DBID>

All Known Subinterfaces:

DBIDRangeDistanceFunction

All Known Implementing Classes:

AbstractDBIDRangeDistanceFunction, DiskCacheBasedDoubleDistanceFunction, DiskCacheBasedFloatDistanceFunction, FileBasedSparseDoubleDistanceFunction, FileBasedSparseFloatDistanceFunction, RandomStableDistanceFunction

public interface DBIDDistanceFunction
extends DistanceFunction<DBID>

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

Since:

0.4.0

Author:

Erich Schubert

Method Summary

Modifier and Type	Method and Description
double	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

getInputTypeRestriction, instantiate, isMetric, isSquared, isSymmetric

Method Detail

distance

double 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