1 files changed, 79 insertions, 0 deletions
diff --git a/src/de/lmu/ifi/dbs/elki/evaluation/scores/adapter/VectorOverThreshold.java b/src/de/lmu/ifi/dbs/elki/evaluation/scores/adapter/VectorOverThreshold.java
new file mode 100644
index 00000000..99c24332
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+++ b/src/de/lmu/ifi/dbs/elki/evaluation/scores/adapter/VectorOverThreshold.java
@@ -0,0 +1,79 @@
+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) 2014
+ 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<DecreasingVectorIter> {
+  /**
+   * 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(DecreasingVectorIter o) {
+    return Math.abs(vec.doubleValue(o.dim())) > threshold;
+  }
+
+  @Override
+  public int numPositive() {
+    return numpos;
+  }
+}
+\ No newline at end of file