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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.
*/
/**
*
* <p>
* This package provides classes to handle sampling steps during
* Ordinary Differential Equations integration.
* </p>
*
* <p>
* In addition to computing the evolution of the state vector at some grid points, all
* ODE integrators also build up interpolation models of this evolution <em>inside</em> the
* last computed step. If users are interested in these interpolators, they can register a
* {@link org.apache.commons.math3.ode.sampling.StepHandler StepHandler} instance using the
* {@link org.apache.commons.math3.ode.FirstOrderIntegrator#addStepHandler addStepHandler}
* method which is supported by all integrators. The integrator will call this instance
* at the end of each accepted step and provide it the interpolator. The user can do
* whatever he wants with this interpolator, which computes both the state and its
* time-derivative. A typical use of step handler is to provide some output to monitor
* the integration process.
* </p>
*
* <p>
* In a sense, this is a kind of Inversion Of Control: rather than having the master
* application driving the slave integrator by providing the target end value for
* the free variable, we get a master integrator scheduling the free variable
* evolution and calling the slave application callbacks that were registered at
* configuration time.
* </p>
*
* <p>
* Since some integrators may use variable step size, the generic {@link
* org.apache.commons.math3.ode.sampling.StepHandler StepHandler} interface can be called
* either at regular or irregular rate. This interface allows to navigate to any location
* within the last computed step, thanks to the provided {@link
* org.apache.commons.math3.ode.sampling.StepInterpolator StepInterpolator} object.
* If regular output is desired (for example in order to write an ephemeris file), then
* the simpler {@link org.apache.commons.math3.ode.sampling.FixedStepHandler FixedStepHandler}
* interface can be used. Objects implementing this interface should be wrapped within a
* {@link org.apache.commons.math3.ode.sampling.StepNormalizer StepNormalizer} instance
* in order to be registered to the integrator.
* </p>
*
*
*/
package org.apache.commons.math3.ode.sampling;
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