blob: a3c311690d668acd3f17cb9e0520492ae2d79cc4 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
package de.lmu.ifi.dbs.elki.utilities.scaling;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2011
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* Scaling function to invert values by computing -1 * Math.log(x)
*
* @author Erich Schubert
*/
public class MinusLogScaling implements StaticScalingFunction {
@Override
public double getScaled(double value) {
return - Math.log(value);
}
@Override
public double getMin() {
return Double.NEGATIVE_INFINITY;
}
@Override
public double getMax() {
return Double.POSITIVE_INFINITY;
}
}
|
