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## org.apache.commons.math.ode.nonstiff
Class AdamsMoultonIntegrator.Corrector

    java.lang.Object
      org.apache.commons.math.ode.nonstiff.AdamsMoultonIntegrator.Corrector

All Implemented Interfaces:
  RealMatrixPreservingVisitor

Enclosing class:
  AdamsMoultonIntegrator

    private class AdamsMoultonIntegrator.Corrector

extends java.lang.Object
implements RealMatrixPreservingVisitor

Corrector for current state in Adams-Moulton method.

This visitor implements the Taylor series formula:

     Yn+1 = yn + s1(n+1) + [ -1 +1 -1 +1 ... ±1 ] rn+1

Field Summary
`private double[]` | `after` Current state after correction.
`private double[]` | `before` Current state before correction.
`private double[]` | `previous` Previous state.
`private double[]` | `scaled` Current scaled first derivative.

Constructor Summary
`AdamsMoultonIntegrator.Corrector(double[] previous, double[] scaled, double[] state)` Simple constructor.

Method Summary
`double` | `end()` End visiting te Nordsieck vector.
`void` | `start(int rows, int columns, int startRow, int endRow, int startColumn, int endColumn)` Start visiting a matrix.
`void` | `visit(int row, int column, double value)` Visit one matrix entry.

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

Field Detail

### previous

    private final double[] previous

  Previous state.

### scaled

    private final double[] scaled

  Current scaled first derivative.

### before

    private final double[] before

  Current state before correction.

### after

    private final double[] after

  Current state after correction.

Constructor Detail

### AdamsMoultonIntegrator.Corrector

    public AdamsMoultonIntegrator.Corrector(double[] previous,
                                            double[] scaled,
                                            double[] state)

  Simple constructor.

  Parameters:
    `previous` - previous state
    `scaled` - current scaled first derivative
    `state` - state to correct (will be overwritten after visit)

Method Detail

### start

    public void start(int rows,
                      int columns,
                      int startRow,
                      int endRow,
                      int startColumn,
                      int endColumn)

  Start visiting a matrix.

  This method is called once before any entry of the matrix is visited.

  Specified by:
    `start` in interface `RealMatrixPreservingVisitor`
  Parameters:
    `rows` - number of rows of the matrix
    `columns` - number of columns of the matrix
    `startRow` - Initial row index
    `endRow` - Final row index (inclusive)
    `startColumn` - Initial column index
    `endColumn` - Final column index (inclusive)

### visit

    public void visit(int row,
                      int column,
                      double value)
               throws MatrixVisitorException

  Visit one matrix entry.

  Specified by:
    `visit` in interface `RealMatrixPreservingVisitor`
  Parameters:
    `row` - row index of the entry
    `column` - column index of the entry
    `value` - current value of the entry
  Throws:
    `MatrixVisitorException` - if something wrong occurs

### end

    public double end()

  End visiting te Nordsieck vector.

  The correction is used to control stepsize. So its amplitude is considered to be an error, which must be normalized according to error control settings. If the normalized value is greater than 1, the correction was too large and the step must be rejected.

  Specified by:
    `end` in interface `RealMatrixPreservingVisitor`
  Returns:
    the normalized correction, if greater than 1, the step must be rejected

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