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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.Field;
+import org.apache.commons.math3.RealFieldElement;
+import org.apache.commons.math3.ode.FieldEquationsMapper;
+import org.apache.commons.math3.ode.FieldODEStateAndDerivative;
+import org.apache.commons.math3.util.MathArrays;
+
+/**
+ * This class implements a second order Runge-Kutta integrator for
+ * Ordinary Differential Equations.
+ *
+ * <p>This method is an explicit Runge-Kutta method, its Butcher-array
+ * is the following one :
+ * <pre>
+ * 0 | 0 0
+ * 1/2 | 1/2 0
+ * |----------
+ * | 0 1
+ * </pre>
+ * </p>
+ *
+ * @see EulerFieldIntegrator
+ * @see ClassicalRungeKuttaFieldIntegrator
+ * @see GillFieldIntegrator
+ * @see ThreeEighthesFieldIntegrator
+ * @see LutherFieldIntegrator
+ *
+ * @param <T> the type of the field elements
+ * @since 3.6
+ */
+
+public class MidpointFieldIntegrator<T extends RealFieldElement<T>> extends RungeKuttaFieldIntegrator<T> {
+
+ /** Simple constructor.
+ * Build a midpoint integrator with the given step.
+ * @param field field to which the time and state vector elements belong
+ * @param step integration step
+ */
+ public MidpointFieldIntegrator(final Field<T> field, final T step) {
+ super(field, "midpoint", step);
+ }
+
+ /** {@inheritDoc} */
+ public T[] getC() {
+ final T[] c = MathArrays.buildArray(getField(), 1);
+ c[0] = getField().getOne().multiply(0.5);
+ return c;
+ }
+
+ /** {@inheritDoc} */
+ public T[][] getA() {
+ final T[][] a = MathArrays.buildArray(getField(), 1, 1);
+ a[0][0] = fraction(1, 2);
+ return a;
+ }
+
+ /** {@inheritDoc} */
+ public T[] getB() {
+ final T[] b = MathArrays.buildArray(getField(), 2);
+ b[0] = getField().getZero();
+ b[1] = getField().getOne();
+ return b;
+ }
+
+ /** {@inheritDoc} */
+ @Override
+ protected MidpointFieldStepInterpolator<T>
+ createInterpolator(final boolean forward, T[][] yDotK,
+ final FieldODEStateAndDerivative<T> globalPreviousState,
+ final FieldODEStateAndDerivative<T> globalCurrentState,
+ final FieldEquationsMapper<T> mapper) {
+ return new MidpointFieldStepInterpolator<T>(getField(), forward, yDotK,
+ globalPreviousState, globalCurrentState,
+ globalPreviousState, globalCurrentState,
+ mapper);
+ }
+
+}