Package elki.distance

Interface DBIDDistance

All Superinterfaces:

Distance<DBID>

All Known Subinterfaces:

DBIDRangeDistance

All Known Implementing Classes:

AbstractDBIDRangeDistance, DiskCacheBasedDoubleDistance, DiskCacheBasedFloatDistance, FileBasedSparseDoubleDistance, FileBasedSparseFloatDistance, RandomStableDistance

public interface DBIDDistance
extends Distance<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	Description
double	distance(DBIDRef id1, DBIDRef id2)	Returns the distance between the two objects specified by their object ids.

Methods inherited from interface elki.distance.Distance

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