de.lmu.ifi.dbs.elki.math.linearalgebra.pca.weightfunctions
Class ExponentialWeight
java.lang.Object
de.lmu.ifi.dbs.elki.math.linearalgebra.pca.weightfunctions.ExponentialWeight
- All Implemented Interfaces:
- WeightFunction, InspectionUtilFrequentlyScanned
public final class ExponentialWeight
- extends Object
- implements WeightFunction
Exponential Weight function, scaled such that the result it 0.1 at distance
== max
exp(-2.3025850929940455 * distance/max)
This is similar to the Gaussian weight function, except distance/max is not
squared.
-2.3025850929940455 is log(-.1) to achieve the intended range of 1.0 - 0.1
Method Summary |
double |
getWeight(double distance,
double max,
double stddev)
Exponential Weight function. stddev is not used. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
ExponentialWeight
public ExponentialWeight()
getWeight
public double getWeight(double distance,
double max,
double stddev)
- Exponential Weight function. stddev is not used.
- Specified by:
getWeight
in interface WeightFunction
- Parameters:
distance
- distance of the query pointmax
- maximum distance of all included pointsstddev
- standard deviation (i.e. quadratic mean / RMS) of the
included points
- Returns:
- weight for the query point