PartialDistance (ELKI: Environment for DeveLoping KDD-Applications Supported by Index-Structures)

All Known Implementing Classes:

PartialEuclideanDistance, PartialLPNormDistance, PartialManhattanDistance, PartialSquaredEuclideanDistance
```
public interface PartialDistance<O>
```
Interface to maintain partial distance bounds.

Since:

0.8.0

Author:

Erich Schubert

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`double`	`combineRaw(double rawdist, double delta, double prevdelta)`	Combine the distance information.
`boolean`	`compareRawRegular(double raw, double reg)`	Check if a "raw" distance is less or equal a regular distance.
`double`	`distance(O a, O b)`	Compute the actual distance of two objects.
`double`	`transformOut(double rawdist)`	Transform a raw distance to an output (external) distance.

- Method Detail
  - combineRaw
```
double combineRaw(double rawdist,
                  double delta,
                  double prevdelta)
```
    Combine the distance information.
    
    Parameters:
    
    rawdist - Raw (often squared) previous distance
    
    delta - New delta
    
    prevdelta - Previous delta
    
    Returns:
    
    New raw distance
  - compareRawRegular
```
boolean compareRawRegular(double raw,
                          double reg)
```
    Check if a "raw" distance is less or equal a regular distance.
    
    Parameters:
    
    raw - Raw distance (usually squared)
    
    reg - Regular distance
    
    Returns:
    
    True if less than or equal
  - distance
```
double distance(O a,
                O b)
```
    Compute the actual distance of two objects.
    
    Parameters:
    
    a - First
    
    b - Second
    
    Returns:
    
    Distance
  - transformOut
```
double transformOut(double rawdist)
```
    Transform a raw distance to an output (external) distance.
    
    Parameters:
    
    rawdist - Raw distance
    
    Returns:
    
    External distance