1 files changed, 46 insertions, 0 deletions
diff --git a/src/main/java/org/apache/commons/math3/ode/nonstiff/FieldButcherArrayProvider.java b/src/main/java/org/apache/commons/math3/ode/nonstiff/FieldButcherArrayProvider.java
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+++ b/src/main/java/org/apache/commons/math3/ode/nonstiff/FieldButcherArrayProvider.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.math3.ode.nonstiff;
+
+import org.apache.commons.math3.RealFieldElement;
+
+/** This interface represents an integrator  based on Butcher arrays.
+ * @see RungeKuttaFieldIntegrator
+ * @see EmbeddedRungeKuttaFieldIntegrator
+ * @param <T> the type of the field elements
+ * @since 3.6
+ */
+
+public interface FieldButcherArrayProvider<T extends RealFieldElement<T>> {
+
+    /** Get the time steps from Butcher array (without the first zero).
+     * @return time steps from Butcher array (without the first zero
+     */
+    T[] getC();
+
+    /** Get the internal weights from Butcher array (without the first empty row).
+     * @return internal weights from Butcher array (without the first empty row)
+     */
+    T[][] getA();
+
+    /** Get the external weights for the high order method from Butcher array.
+     * @return external weights for the high order method from Butcher array
+     */
+    T[] getB();
+
+}