1 files changed, 16 insertions, 1 deletions
diff --git a/src/de/lmu/ifi/dbs/elki/math/statistics/distribution/ChiDistribution.java b/src/de/lmu/ifi/dbs/elki/math/statistics/distribution/ChiDistribution.java
index c561c4cd..84c86e98 100644
--- a/src/de/lmu/ifi/dbs/elki/math/statistics/distribution/ChiDistribution.java
+++ b/src/de/lmu/ifi/dbs/elki/math/statistics/distribution/ChiDistribution.java
@@ -1,5 +1,7 @@
 package de.lmu.ifi.dbs.elki.math.statistics.distribution;
 
+import de.lmu.ifi.dbs.elki.utilities.exceptions.ExceptionMessages;
+
 /*
  This file is part of ELKI:
  Environment for Developing KDD-Applications Supported by Index-Structures
@@ -27,8 +29,10 @@ package de.lmu.ifi.dbs.elki.math.statistics.distribution;
  * Chi distribution.
  * 
  * @author Erich Schubert
+ * 
+ * @apiviz.composedOf ChiSquaredDistribution
  */
-public class ChiDistribution implements Distribution {
+public class ChiDistribution implements DistributionWithRandom {
   /**
    * Degrees of freedom. Usually integer.
    */
@@ -89,4 +93,15 @@ public class ChiDistribution implements Distribution {
   public static double cdf(double val, double dof) {
     return GammaDistribution.regularizedGammaP(dof / 2, val * val / 2);
   }
+
+  // FIXME: implement!
+  @Override
+  public double quantile(double val) {
+    throw new UnsupportedOperationException(ExceptionMessages.UNSUPPORTED_NOT_YET);
+  }
+
+  @Override
+  public String toString() {
+    return "ChiDistribution(dof=" + dof + ")";
+  }
 }
 \ No newline at end of file