org.apache.commons.math3.filter

## Class DefaultMeasurementModel

- java.lang.Object
- - org.apache.commons.math3.filter.DefaultMeasurementModel

- All Implemented Interfaces:
    MeasurementModel

      public class DefaultMeasurementModel
      extends Object
      implements MeasurementModel

  Default implementation of a `MeasurementModel` for the use with a `KalmanFilter`.
  Since:
    3.0

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `DefaultMeasurementModel(double[][] measMatrix, double[][] measNoise)` Create a new `MeasurementModel`, taking double arrays as input parameters for the respective measurement matrix and noise.
    `DefaultMeasurementModel(RealMatrix measMatrix, RealMatrix measNoise)` Create a new `MeasurementModel`, taking `RealMatrix` objects as input parameters for the respective measurement matrix and noise.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `RealMatrix` | `getMeasurementMatrix()` Returns the measurement matrix.
    `RealMatrix` | `getMeasurementNoise()` Returns the measurement noise matrix.

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

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

- - ### Constructor Detail

    - #### DefaultMeasurementModel

          public DefaultMeasurementModel(double[][] measMatrix,
                                 double[][] measNoise)
                                  throws NullArgumentException,
                                         NoDataException,
                                         DimensionMismatchException

      Create a new `MeasurementModel`, taking double arrays as input parameters for the respective measurement matrix and noise.
      Parameters:
        `measMatrix` - the measurement matrix
        `measNoise` - the measurement noise matrix
      Throws:
        `NullArgumentException` - if any of the input matrices is `null`
        `NoDataException` - if any row / column dimension of the input matrices is zero
        `DimensionMismatchException` - if any of the input matrices is non-rectangular

    - #### DefaultMeasurementModel

          public DefaultMeasurementModel(RealMatrix measMatrix,
                                 RealMatrix measNoise)

      Create a new `MeasurementModel`, taking `RealMatrix` objects as input parameters for the respective measurement matrix and noise.
      Parameters:
        `measMatrix` - the measurement matrix
        `measNoise` - the measurement noise matrix

  - ### Method Detail

    - #### getMeasurementMatrix

          public RealMatrix getMeasurementMatrix()

      Returns the measurement matrix.
      Specified by:
        `getMeasurementMatrix` in interface `MeasurementModel`
      Returns:
        the measurement matrix

    - #### getMeasurementNoise

          public RealMatrix getMeasurementNoise()

      Returns the measurement noise matrix. This method is called by the `KalmanFilter` every correction step, so implementations of this interface may return a modified measurement noise depending on the current iteration step.
      Specified by:
        `getMeasurementNoise` in interface `MeasurementModel`
      Returns:
        the measurement noise matrix
      See Also:
        `KalmanFilter.correct(double[])`, `KalmanFilter.correct(org.apache.commons.math3.linear.RealVector)`

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