de.lmu.ifi.dbs.elki.utilities.scaling.outlier

Class OutlierSqrtScaling

java.lang.Object

de.lmu.ifi.dbs.elki.utilities.scaling.outlier.OutlierSqrtScaling

All Implemented Interfaces:

OutlierScaling, ScalingFunction

public class OutlierSqrtScaling
extends java.lang.Object
implements OutlierScaling

Scaling that can map arbitrary positive values to a value in the range of [0:1].

Transformation is done by taking the square root, then doing a linear linear mapping onto 0:1 using the minimum values seen.

Since:

0.3

Author:

Erich Schubert

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	OutlierSqrtScaling.Parameterizer Parameterization class.

Field Summary

Fields

Modifier and Type	Field and Description
protected double	factor Scaling factor
protected double	max Minimum and maximum values.
protected double	min Minimum and maximum values.
protected java.lang.Double	pmax Predefined minimum and maximum values.
protected java.lang.Double	pmin Predefined minimum and maximum values.

Constructor Summary

Constructors

Constructor and Description
OutlierSqrtScaling(java.lang.Double pmin, java.lang.Double pmax) Constructor.

Method Summary

Modifier and Type	Method and Description
double	getMax() Get maximum resulting value.
double	getMin() Get minimum resulting value.
double	getScaled(double value) Transform a given value using the scaling function.
<A> void	prepare(A array, NumberArrayAdapter<?,A> adapter) Prepare is called once for each data set, before getScaled() will be called.
void	prepare(OutlierResult or) Prepare is called once for each data set, before getScaled() will be called.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

min

protected double min

Minimum and maximum values.

max

protected double max

Minimum and maximum values.

pmin

protected java.lang.Double pmin

Predefined minimum and maximum values.

pmax

protected java.lang.Double pmax

Predefined minimum and maximum values.

factor

protected double factor

Scaling factor

Constructor Detail

OutlierSqrtScaling

public OutlierSqrtScaling(java.lang.Double pmin,
                          java.lang.Double pmax)

Constructor.

Parameters:

pmin - Predefined minimum

pmax - Predefined maximum

Method Detail

getScaled

public double getScaled(double value)

Description copied from interface: ScalingFunction

Transform a given value using the scaling function.

Specified by:

getScaled in interface ScalingFunction

Parameters:

value - Original value

Returns:

Scaled value

prepare

public void prepare(OutlierResult or)

Description copied from interface: OutlierScaling

Prepare is called once for each data set, before getScaled() will be called. This function can be used to extract global parameters such as means, minimums or maximums from the outlier scores.

Specified by:

prepare in interface OutlierScaling

Parameters:

or - Outlier result to use

prepare

public <A> void prepare(A array,
                        NumberArrayAdapter<?,A> adapter)

Description copied from interface: OutlierScaling

Prepare is called once for each data set, before getScaled() will be called. This function can be used to extract global parameters such as means, minimums or maximums from the score array. The method using a full OutlierResult is preferred, as it will allow access to the metadata.

Specified by:

prepare in interface OutlierScaling

Parameters:

array - Data to process

adapter - Array adapter

getMin

public double getMin()

Description copied from interface: ScalingFunction

Get minimum resulting value. May be Double.NaN or Double.NEGATIVE_INFINITY.

Specified by:

getMin in interface ScalingFunction

Returns:

Minimum resulting value.

getMax

public double getMax()

Description copied from interface: ScalingFunction

Get maximum resulting value. May be Double.NaN or Double.POSITIVE_INFINITY.

Specified by:

getMax in interface ScalingFunction

Returns:

Maximum resulting value.