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## org.apache.commons.math.ode.jacobians
Class FirstOrderIntegratorWithJacobians.StepInterpolatorWrapper

    java.lang.Object
      org.apache.commons.math.ode.jacobians.FirstOrderIntegratorWithJacobians.StepInterpolatorWrapper

All Implemented Interfaces:
  Externalizable, Serializable, StepInterpolatorWithJacobians

Enclosing class:
  FirstOrderIntegratorWithJacobians

    private static class FirstOrderIntegratorWithJacobians.StepInterpolatorWrapper

extends Object
implements StepInterpolatorWithJacobians

Wrapper for step interpolators.

Field Summary
`private double[][]` | `dydp` Jacobian with respect to parameters dy/dp.
`private double[][]` | `dydpDot` Time derivative of the jacobian with respect to parameters dy/dp.
`private double[][]` | `dydy0` Jacobian with respect to initial state dy/dy0.
`private double[][]` | `dydy0Dot` Time derivative of the sacobian with respect to initial state dy/dy0.
`private StepInterpolator` | `interpolator` Wrapped interpolator.
`private double[]` | `y` State array.
`private double[]` | `yDot` Time derivative of the state array.

Constructor Summary
`FirstOrderIntegratorWithJacobians.StepInterpolatorWrapper()` Simple constructor.
`FirstOrderIntegratorWithJacobians.StepInterpolatorWrapper(StepInterpolator interpolator, int n, int k)` Simple constructor.

Method Summary
`StepInterpolatorWithJacobians` | `copy()` Copy the instance.
`private static void` | `copyArray(double[][] src, double[][] dest)` Copy an array.
`private static void` | `copyArray(double[] src, double[] dest)` Copy an array.
`double` | `getCurrentTime()` Get the current grid point time.
`double[][]` | `getInterpolatedDyDp()` Get the partial derivatives of the state vector with respect to the ODE parameters of the interpolated point.
`double[][]` | `getInterpolatedDyDpDot()` Get the time derivatives of the jacobian of the state vector with respect to the ODE parameters of the interpolated point.
`double[][]` | `getInterpolatedDyDy0()` Get the partial derivatives of the state vector with respect to the initial state of the interpolated point.
`double[][]` | `getInterpolatedDyDy0Dot()` Get the time derivatives of the jacobian of the state vector with respect to the initial state of the interpolated point.
`double` | `getInterpolatedTime()` Get the time of the interpolated point.
`double[]` | `getInterpolatedY()` Get the state vector of the interpolated point.
`double[]` | `getInterpolatedYDot()` Get the time derivatives of the state vector of the interpolated point.
`double` | `getPreviousTime()` Get the previous grid point time.
`boolean` | `isForward()` Check if the natural integration direction is forward.
`private static void` | `readArray(ObjectInput in, double[] array)` Read an array.
`private static void` | `readArray(ObjectInput in, double[][] array)` Read an array.
`void` | `readExternal(ObjectInput in)`
`void` | `setInterpolatedTime(double time)` Set the time of the interpolated point.
`private static void` | `writeArray(ObjectOutput out, double[] array)` Write an array.
`private static void` | `writeArray(ObjectOutput out, double[][] array)` Write an array.
`void` | `writeExternal(ObjectOutput out)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### interpolator

    private StepInterpolator interpolator

  Wrapped interpolator.

### y

    private double[] y

  State array.

### dydy0

    private double[][] dydy0

  Jacobian with respect to initial state dy/dy0.

### dydp

    private double[][] dydp

  Jacobian with respect to parameters dy/dp.

### yDot

    private double[] yDot

  Time derivative of the state array.

### dydy0Dot

    private double[][] dydy0Dot

  Time derivative of the sacobian with respect to initial state dy/dy0.

### dydpDot

    private double[][] dydpDot

  Time derivative of the jacobian with respect to parameters dy/dp.

Constructor Detail

### FirstOrderIntegratorWithJacobians.StepInterpolatorWrapper

    public FirstOrderIntegratorWithJacobians.StepInterpolatorWrapper()

  Simple constructor.

  This constructor is used only for externalization. It does nothing.

### FirstOrderIntegratorWithJacobians.StepInterpolatorWrapper

    public FirstOrderIntegratorWithJacobians.StepInterpolatorWrapper(StepInterpolator interpolator,
                                                                     int n,
                                                                     int k)

  Simple constructor.

  Parameters:
    `interpolator` - wrapped interpolator
    `n` - dimension of the original ODE
    `k` - number of parameters

Method Detail

### setInterpolatedTime

    public void setInterpolatedTime(double time)

  Set the time of the interpolated point.

  Setting the time outside of the current step is now allowed, but should be used with care since the accuracy of the interpolator will probably be very poor far from this step. This allowance has been added to simplify implementation of search algorithms near the step endpoints.

  Setting the time changes the instance internal state. If a specific state must be preserved, a copy of the instance must be created using `StepInterpolatorWithJacobians.copy()`.

  Specified by:
    `setInterpolatedTime` in interface `StepInterpolatorWithJacobians`
  Parameters:
    `time` - time of the interpolated point

### isForward

    public boolean isForward()

  Check if the natural integration direction is forward.

  This method provides the integration direction as specified by the integrator itself, it avoid some nasty problems in degenerated cases like null steps due to cancellation at step initialization, step control or discrete events triggering.

  Specified by:
    `isForward` in interface `StepInterpolatorWithJacobians`
  Returns:
    true if the integration variable (time) increases during integration

### getPreviousTime

    public double getPreviousTime()

  Get the previous grid point time.

  Specified by:
    `getPreviousTime` in interface `StepInterpolatorWithJacobians`
  Returns:
    previous grid point time

### getInterpolatedTime

    public double getInterpolatedTime()

  Get the time of the interpolated point. If `StepInterpolatorWithJacobians.setInterpolatedTime(double)` has not been called, it returns the current grid point time.

  Specified by:
    `getInterpolatedTime` in interface `StepInterpolatorWithJacobians`
  Returns:
    interpolation point time

### getInterpolatedY

    public double[] getInterpolatedY()
                              throws DerivativeException

  Get the state vector of the interpolated point.

  The returned vector is a reference to a reused array, so it should not be modified and it should be copied if it needs to be preserved across several calls.

  Specified by:
    `getInterpolatedY` in interface `StepInterpolatorWithJacobians`
  Returns:
    state vector at time `StepInterpolatorWithJacobians.getInterpolatedTime()`
  Throws:
    `DerivativeException` - if this call induces an automatic step finalization that throws one
  See Also:
    `StepInterpolatorWithJacobians.getInterpolatedYDot()`

### getInterpolatedDyDy0

    public double[][] getInterpolatedDyDy0()
                                    throws DerivativeException

  Get the partial derivatives of the state vector with respect to the initial state of the interpolated point.

  The returned vector is a reference to a reused array, so it should not be modified and it should be copied if it needs to be preserved across several calls.

  Specified by:
    `getInterpolatedDyDy0` in interface `StepInterpolatorWithJacobians`
  Returns:
    partial derivatives of the state vector with respect to the initial state at time `StepInterpolatorWithJacobians.getInterpolatedTime()`
  Throws:
    `DerivativeException` - if this call induces an automatic step finalization that throws one
  See Also:
    `StepInterpolatorWithJacobians.getInterpolatedY()`

### getInterpolatedDyDp

    public double[][] getInterpolatedDyDp()
                                   throws DerivativeException

  Get the partial derivatives of the state vector with respect to the ODE parameters of the interpolated point.

  The returned vector is a reference to a reused array, so it should not be modified and it should be copied if it needs to be preserved across several calls.

  Specified by:
    `getInterpolatedDyDp` in interface `StepInterpolatorWithJacobians`
  Returns:
    partial derivatives of the state vector with respect to the ODE parameters at time `StepInterpolatorWithJacobians.getInterpolatedTime()`
  Throws:
    `DerivativeException` - if this call induces an automatic step finalization that throws one
  See Also:
    `StepInterpolatorWithJacobians.getInterpolatedY()`

### getInterpolatedYDot

    public double[] getInterpolatedYDot()
                                 throws DerivativeException

  Get the time derivatives of the state vector of the interpolated point.

  The returned vector is a reference to a reused array, so it should not be modified and it should be copied if it needs to be preserved across several calls.

  Specified by:
    `getInterpolatedYDot` in interface `StepInterpolatorWithJacobians`
  Returns:
    derivatives of the state vector at time `StepInterpolatorWithJacobians.getInterpolatedTime()`
  Throws:
    `DerivativeException` - if this call induces an automatic step finalization that throws one
  See Also:
    `StepInterpolatorWithJacobians.getInterpolatedY()`

### getInterpolatedDyDy0Dot

    public double[][] getInterpolatedDyDy0Dot()
                                       throws DerivativeException

  Get the time derivatives of the jacobian of the state vector with respect to the initial state of the interpolated point.

  The returned vector is a reference to a reused array, so it should not be modified and it should be copied if it needs to be preserved across several calls.

  Specified by:
    `getInterpolatedDyDy0Dot` in interface `StepInterpolatorWithJacobians`
  Returns:
    time derivatives of the jacobian of the state vector with respect to the initial state at time `StepInterpolatorWithJacobians.getInterpolatedTime()`
  Throws:
    `DerivativeException` - if this call induces an automatic step finalization that throws one
  See Also:
    `StepInterpolatorWithJacobians.getInterpolatedY()`

### getInterpolatedDyDpDot

    public double[][] getInterpolatedDyDpDot()
                                      throws DerivativeException

  Get the time derivatives of the jacobian of the state vector with respect to the ODE parameters of the interpolated point.

  The returned vector is a reference to a reused array, so it should not be modified and it should be copied if it needs to be preserved across several calls.

  Specified by:
    `getInterpolatedDyDpDot` in interface `StepInterpolatorWithJacobians`
  Returns:
    time derivatives of the jacobian of the state vector with respect to the ODE parameters at time `StepInterpolatorWithJacobians.getInterpolatedTime()`
  Throws:
    `DerivativeException` - if this call induces an automatic step finalization that throws one
  See Also:
    `StepInterpolatorWithJacobians.getInterpolatedY()`

### getCurrentTime

    public double getCurrentTime()

  Get the current grid point time.

  Specified by:
    `getCurrentTime` in interface `StepInterpolatorWithJacobians`
  Returns:
    current grid point time

### copy

    public StepInterpolatorWithJacobians copy()
                                       throws DerivativeException

  Copy the instance.

  The copied instance is guaranteed to be independent from the original one. Both can be used with different settings for interpolated time without any side effect.

  Specified by:
    `copy` in interface `StepInterpolatorWithJacobians`
  Returns:
    a deep copy of the instance, which can be used independently.
  Throws:
    `DerivativeException` - if this call induces an automatic step finalization that throws one
  See Also:
    `StepInterpolatorWithJacobians.setInterpolatedTime(double)`

### writeExternal

    public void writeExternal(ObjectOutput out)
                       throws IOException

  Specified by:
    `writeExternal` in interface `Externalizable`
  Throws:
    `IOException`

### readExternal

    public void readExternal(ObjectInput in)
                      throws IOException,
                             ClassNotFoundException

  Specified by:
    `readExternal` in interface `Externalizable`
  Throws:
    `IOException`
    `ClassNotFoundException`

### copyArray

    private static void copyArray(double[] src,
                                  double[] dest)

  Copy an array.

  Parameters:
    `src` - source array
    `dest` - destination array

### copyArray

    private static void copyArray(double[][] src,
                                  double[][] dest)

  Copy an array.

  Parameters:
    `src` - source array
    `dest` - destination array

### writeArray

    private static void writeArray(ObjectOutput out,
                                   double[] array)
                            throws IOException

  Write an array.

  Parameters:
    `out` - output stream
    `array` - array to write
  Throws:
    `IOException` - if array cannot be read

### writeArray

    private static void writeArray(ObjectOutput out,
                                   double[][] array)
                            throws IOException

  Write an array.

  Parameters:
    `out` - output stream
    `array` - array to write
  Throws:
    `IOException` - if array cannot be read

### readArray

    private static void readArray(ObjectInput in,
                                  double[] array)
                           throws IOException

  Read an array.

  Parameters:
    `in` - input stream
    `array` - array to read
  Throws:
    `IOException` - if array cannot be read

### readArray

    private static void readArray(ObjectInput in,
                                  double[][] array)
                           throws IOException

  Read an array.

  Parameters:
    `in` - input stream
    `array` - array to read
  Throws:
    `IOException` - if array cannot be read

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