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

Interface DBIDRangeDistanceFunction

All Superinterfaces:

DBIDDistanceFunction, DistanceFunction<DBID>

All Known Implementing Classes:

AbstractDBIDRangeDistanceFunction, DiskCacheBasedDoubleDistanceFunction, DiskCacheBasedFloatDistanceFunction, FileBasedSparseDoubleDistanceFunction, FileBasedSparseFloatDistanceFunction

public interface DBIDRangeDistanceFunction
extends DBIDDistanceFunction

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

Since:

0.7.0

Author:

Erich Schubert

Method Summary

Modifier and Type	Method and Description
void	checkRange(DBIDRange range) Validate the range of DBIDs to use.
double	distance(int i1, int i2) Compute the distance for two integer offsets.

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

distance

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

getInputTypeRestriction, instantiate, isMetric, isSquared, isSymmetric

Method Detail

distance

double distance(int i1,
                int i2)

Compute the distance for two integer offsets.

Parameters:

i1 - First offset

i2 - Second offset

Returns:

Distance

checkRange

void checkRange(DBIDRange range)

Validate the range of DBIDs to use. This will log a warning if an obvious mismatch was found.

Parameters:

range - DBID range