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diff --git a/src/main/java/org/apache/commons/math/analysis/interpolation/MultivariateRealInterpolator.java b/src/main/java/org/apache/commons/math/analysis/interpolation/MultivariateRealInterpolator.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.commons.math.analysis.interpolation;
+
+import org.apache.commons.math.MathException;
+import org.apache.commons.math.analysis.MultivariateRealFunction;
+
+/**
+ * Interface representing a univariate real interpolating function.
+ *
+ * @since 2.1
+ * @version $Revision: 924794 $ $Date: 2010-03-18 15:15:50 +0100 (jeu. 18 mars 2010) $
+ */
+public interface MultivariateRealInterpolator {
+
+    /**
+     * Computes an interpolating function for the data set.
+     *
+     * @param xval the arguments for the interpolation points.
+     * {@code xval[i][0]} is the first component of interpolation point
+     * {@code i}, {@code xval[i][1]} is the second component, and so on
+     * until {@code xval[i][d-1]}, the last component of that interpolation
+     * point (where {@code d} is thus the dimension of the space).
+     * @param yval the values for the interpolation points
+     * @return a function which interpolates the data set
+     * @throws MathException if arguments violate assumptions made by the
+     *         interpolation algorithm or some dimension mismatch occurs
+     * @throws IllegalArgumentException if there are no data (xval null or zero length)
+     */
+    MultivariateRealFunction interpolate(double[][] xval, double[] yval)
+        throws MathException, IllegalArgumentException;
+}