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diff --git a/elki/src/main/java/de/lmu/ifi/dbs/elki/math/linearalgebra/fitting/FittingFunction.java b/elki/src/main/java/de/lmu/ifi/dbs/elki/math/linearalgebra/fitting/FittingFunction.java
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+++ b/elki/src/main/java/de/lmu/ifi/dbs/elki/math/linearalgebra/fitting/FittingFunction.java
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+package de.lmu.ifi.dbs.elki.math.linearalgebra.fitting;
+
+/*
+ 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/>.
+ */
+
+
+/**
+ * Interface for a function used in Levenberg-Marquard-Fitting
+ * 
+ * @author Erich Schubert
+ */
+public interface FittingFunction {
+  /**
+   * Compute value at position x as well as gradients for the parameters
+   * 
+   * @param x Current coordinate
+   * @param params Function parameters parameters
+   * @return Array consisting of y value and parameter gradients
+   */
+  FittingFunctionResult eval(double x, double[] params);
+}