# ODEJacobiansProvider.java

```/*
* Licensed to the Hipparchus project under one or more
* contributor license agreements.  See the NOTICE file distributed with
* The Hipparchus project 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
*
*
* Unless required by applicable law or agreed to in writing, software
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
*/
package org.hipparchus.ode;

import java.util.Collections;
import java.util.List;

import org.hipparchus.exception.MathIllegalArgumentException;
import org.hipparchus.exception.MathIllegalStateException;

/** Interface expanding {@link OrdinaryDifferentialEquation first order
*  differential equations} in order to compute exactly the Jacobian
*  matrices for {@link VariationalEquation partial derivatives equations}.
*/
public interface ODEJacobiansProvider
extends OrdinaryDifferentialEquation, NamedParameterJacobianProvider {

/** Compute the Jacobian matrix of ODE with respect to state.
* @param t current value of the independent <I>time</I> variable
* @param y array containing the current value of the main state vector
* @param yDot array containing the current value of the time derivative of the main state vector
* @return Jacobian matrix of the ODE w.r.t. the main state vector
* @exception MathIllegalStateException if the number of functions evaluations is exceeded
* @exception MathIllegalArgumentException if arrays dimensions do not match equations settings
*/
double[][] computeMainStateJacobian(double t, double[] y, double[] yDot)
throws MathIllegalArgumentException, MathIllegalStateException;

/** {@inheritDoc}
* <p>
* The default implementation has no parameters at all.
* </p>
*/
@Override
default List<String> getParametersNames() {
return Collections.emptyList();
}

/** {@inheritDoc}
* <p>
* The default implementation supports no parameters at all.
* </p>
*/
@Override
default boolean isSupported(String name) {
return false;
}

/** {@inheritDoc}
* <p>
* The default implementation supports no parameters at all.
* </p>
*/
@Override
default double[] computeParameterJacobian(double t, double[] y, double[] yDot,
String paramName)
throws MathIllegalArgumentException {
throw new MathIllegalArgumentException(LocalizedODEFormats.UNKNOWN_PARAMETER,
paramName);
}

}
```