diff options
Diffstat (limited to 'elki/src/main/java/de/lmu/ifi/dbs/elki/evaluation/scores/adapter/VectorOverThreshold.java')
-rw-r--r-- | elki/src/main/java/de/lmu/ifi/dbs/elki/evaluation/scores/adapter/VectorOverThreshold.java | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/elki/src/main/java/de/lmu/ifi/dbs/elki/evaluation/scores/adapter/VectorOverThreshold.java b/elki/src/main/java/de/lmu/ifi/dbs/elki/evaluation/scores/adapter/VectorOverThreshold.java new file mode 100644 index 00000000..e35db2ee --- /dev/null +++ b/elki/src/main/java/de/lmu/ifi/dbs/elki/evaluation/scores/adapter/VectorOverThreshold.java @@ -0,0 +1,80 @@ +package de.lmu.ifi.dbs.elki.evaluation.scores.adapter; + +/* + This file is part of ELKI: + Environment for Developing KDD-Applications Supported by Index-Structures + + Copyright (C) 2015 + 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/>. + */ + +import de.lmu.ifi.dbs.elki.data.NumberVector; +import de.lmu.ifi.dbs.elki.evaluation.scores.ScoreEvaluation.Predicate; + +/** + * Class that uses a NumberVector as reference, and considers all non-zero + * values as positive entries. + * + * @apiviz.composedOf NumberVector + * + * @author Erich Schubert + */ +public class VectorOverThreshold implements Predicate<AbstractVectorIter> { + /** + * Vector to use as reference + */ + NumberVector vec; + + /** + * Threshold + */ + double threshold; + + /** + * Number of positive values. + */ + int numpos; + + /** + * Constructor. + * + * @param vec Reference vector. + * @param threshold Threshold value. + */ + public VectorOverThreshold(NumberVector vec, double threshold) { + super(); + this.vec = vec; + this.threshold = threshold; + this.numpos = 0; + for(int i = 0, l = vec.getDimensionality(); i < l; i++) { + if(vec.doubleValue(i) > threshold) { + ++numpos; + } + } + } + + @Override + public boolean test(AbstractVectorIter o) { + return vec.doubleValue(o.dim()) > threshold; + } + + @Override + public int numPositive() { + return numpos; + } +}
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