org.apache.commons.math3.ode

## Class JacobianMatrices.MainStateJacobianWrapper

- java.lang.Object
- - org.apache.commons.math3.ode.JacobianMatrices.MainStateJacobianWrapper

All Implemented Interfaces:
  FirstOrderDifferentialEquations, MainStateJacobianProvider

Enclosing class:
  JacobianMatrices

    private static class JacobianMatrices.MainStateJacobianWrapper
    extends java.lang.Object
    implements MainStateJacobianProvider

Wrapper class to compute jacobian matrices by finite differences for ODE which do not compute them by themselves.

### Field Summary

Fields
`private double[]` `hY` Steps for finite difference computation of the jacobian df/dy w.r.t.
`private FirstOrderDifferentialEquations` `ode` Raw ODE without jacobians computation skill to be wrapped into a MainStateJacobianProvider.

### Constructor Summary

Constructors
Constructor and Description
`JacobianMatrices.MainStateJacobianWrapper(FirstOrderDifferentialEquations ode, double[] hY)` Wrap a `FirstOrderDifferentialEquations` into a `MainStateJacobianProvider`.

### Method Summary

Methods
`void` `computeDerivatives(double t, double[] y, double[] yDot)` Get the current time derivative of the state vector.
`void` `computeMainStateJacobian(double t, double[] y, double[] yDot, double[][] dFdY)` Compute the jacobian matrix of ODE with respect to main state.
`int` `getDimension()` Get the dimension of the problem.

### Methods inherited from class java.lang.Object

`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

### Field Detail

#### ode

    private final FirstOrderDifferentialEquations ode

Raw ODE without jacobians computation skill to be wrapped into a MainStateJacobianProvider.

#### hY

    private final double[] hY

Steps for finite difference computation of the jacobian df/dy w.r.t. state.

### Constructor Detail

#### JacobianMatrices.MainStateJacobianWrapper

    public JacobianMatrices.MainStateJacobianWrapper(FirstOrderDifferentialEquations ode,
                                             double[] hY)
                                              throws DimensionMismatchException

Wrap a `FirstOrderDifferentialEquations` into a `MainStateJacobianProvider`.

Parameters:
  `ode` - original ODE problem, without jacobians computation skill
  `hY` - step sizes to compute the jacobian df/dy
Throws:
  `DimensionMismatchException` - if there is a dimension mismatch between the steps array `hY` and the equation dimension
See Also:
  `JacobianMatrices#setMainStateSteps(double[])`

### Method Detail

#### getDimension

    public int getDimension()

Get the dimension of the problem.

Specified by:
  `getDimension` in interface `FirstOrderDifferentialEquations`
Returns:
  dimension of the problem

#### computeDerivatives

    public void computeDerivatives(double t,
                          double[] y,
                          double[] yDot)
                            throws MaxCountExceededException,
                                   DimensionMismatchException

Get the current time derivative of the state vector.

Specified by:
  `computeDerivatives` in interface `FirstOrderDifferentialEquations`
Parameters:
  `t` - current value of the independent time variable
  `y` - array containing the current value of the state vector
  `yDot` - placeholder array where to put the time derivative of the state vector
Throws:
  `MaxCountExceededException` - if the number of functions evaluations is exceeded
  `DimensionMismatchException` - if arrays dimensions do not match equations settings

#### computeMainStateJacobian

    public void computeMainStateJacobian(double t,
                                double[] y,
                                double[] yDot,
                                double[][] dFdY)
                                  throws MaxCountExceededException,
                                         DimensionMismatchException

Compute the jacobian matrix of ODE with respect to main state.

Specified by:
  `computeMainStateJacobian` in interface `MainStateJacobianProvider`
Parameters:
  `t` - current value of the independent time variable
  `y` - array containing the current value of the main state vector
  `yDot` - array containing the current value of the time derivative of the main state vector
  `dFdY` - placeholder array where to put the jacobian matrix of the ODE w.r.t. the main state vector
Throws:
  `MaxCountExceededException` - if the number of functions evaluations is exceeded
  `DimensionMismatchException` - if arrays dimensions do not match equations settings