org.apache.commons.math3.linear

## Class OpenMapRealMatrix

- java.lang.Object
- - org.apache.commons.math3.linear.RealLinearOperator
  - - org.apache.commons.math3.linear.AbstractRealMatrix
    - - org.apache.commons.math3.linear.OpenMapRealMatrix

- All Implemented Interfaces:
    Serializable, AnyMatrix, RealMatrix, SparseRealMatrix

      public class OpenMapRealMatrix
      extends AbstractRealMatrix
      implements SparseRealMatrix, Serializable

  Sparse matrix implementation based on an open addressed map.

  Caveat: This implementation assumes that, for any `x`, the equality `x * 0d == 0d` holds. But it is is not true for `NaN`. Moreover, zero entries will lose their sign. Some operations (that involve `NaN` and/or infinities) may thus give incorrect results.

  Since:
    2.0
  See Also:
    Serialized Form

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `OpenMapRealMatrix(int rowDimension, int columnDimension)` Build a sparse matrix with the supplied row and column dimensions.
    `OpenMapRealMatrix(OpenMapRealMatrix matrix)` Build a matrix by copying another one.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `OpenMapRealMatrix` | `add(OpenMapRealMatrix m)` Compute the sum of this matrix and `m`.
    `void` | `addToEntry(int row, int column, double increment)` Adds (in place) the specified value to the specified entry of `this` matrix.
    `OpenMapRealMatrix` | `copy()` Returns a (deep) copy of this.
    `OpenMapRealMatrix` | `createMatrix(int rowDimension, int columnDimension)` Create a new RealMatrix of the same type as the instance with the supplied row and column dimensions.
    `int` | `getColumnDimension()` Returns the number of columns of this matrix.
    `double` | `getEntry(int row, int column)` Get the entry in the specified row and column.
    `int` | `getRowDimension()` Returns the number of rows of this matrix.
    `OpenMapRealMatrix` | `multiply(OpenMapRealMatrix m)` Postmultiply this matrix by `m`.
    `RealMatrix` | `multiply(RealMatrix m)` Returns the result of postmultiplying `this` by `m`.
    `void` | `multiplyEntry(int row, int column, double factor)` Multiplies (in place) the specified entry of `this` matrix by the specified value.
    `void` | `setEntry(int row, int column, double value)` Set the entry in the specified row and column.
    `OpenMapRealMatrix` | `subtract(OpenMapRealMatrix m)` Subtract `m` from this matrix.
    `OpenMapRealMatrix` | `subtract(RealMatrix m)` Returns `this` minus `m`.

    - ### Methods inherited from class org.apache.commons.math3.linear.AbstractRealMatrix

      `add, copySubMatrix, copySubMatrix, equals, getColumn, getColumnMatrix, getColumnVector, getData, getFrobeniusNorm, getNorm, getRow, getRowMatrix, getRowVector, getSubMatrix, getSubMatrix, getTrace, hashCode, isSquare, operate, operate, power, preMultiply, preMultiply, preMultiply, scalarAdd, scalarMultiply, setColumn, setColumnMatrix, setColumnVector, setRow, setRowMatrix, setRowVector, setSubMatrix, toString, transpose, walkInColumnOrder, walkInColumnOrder, walkInColumnOrder, walkInColumnOrder, walkInOptimizedOrder, walkInOptimizedOrder, walkInOptimizedOrder, walkInOptimizedOrder, walkInRowOrder, walkInRowOrder, walkInRowOrder, walkInRowOrder`

    - ### Methods inherited from class org.apache.commons.math3.linear.RealLinearOperator

      `isTransposable, operateTranspose`

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

      `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

    - ### Methods inherited from interface org.apache.commons.math3.linear.RealMatrix

      `add, copySubMatrix, copySubMatrix, getColumn, getColumnMatrix, getColumnVector, getData, getFrobeniusNorm, getNorm, getRow, getRowMatrix, getRowVector, getSubMatrix, getSubMatrix, getTrace, operate, operate, power, preMultiply, preMultiply, preMultiply, scalarAdd, scalarMultiply, setColumn, setColumnMatrix, setColumnVector, setRow, setRowMatrix, setRowVector, setSubMatrix, transpose, walkInColumnOrder, walkInColumnOrder, walkInColumnOrder, walkInColumnOrder, walkInOptimizedOrder, walkInOptimizedOrder, walkInOptimizedOrder, walkInOptimizedOrder, walkInRowOrder, walkInRowOrder, walkInRowOrder, walkInRowOrder`

    - ### Methods inherited from interface org.apache.commons.math3.linear.AnyMatrix

      `isSquare`

- - ### Constructor Detail

    - #### OpenMapRealMatrix

          public OpenMapRealMatrix(int rowDimension,
                           int columnDimension)
                            throws NotStrictlyPositiveException,
                                   NumberIsTooLargeException

      Build a sparse matrix with the supplied row and column dimensions.
      Parameters:
        `rowDimension` - Number of rows of the matrix.
        `columnDimension` - Number of columns of the matrix.
      Throws:
        `NotStrictlyPositiveException` - if row or column dimension is not positive.
        `NumberIsTooLargeException` - if the total number of entries of the matrix is larger than `Integer.MAX_VALUE`.

    - #### OpenMapRealMatrix

          public OpenMapRealMatrix(OpenMapRealMatrix matrix)

      Build a matrix by copying another one.
      Parameters:
        `matrix` - matrix to copy.

  - ### Method Detail

    - #### copy

          public OpenMapRealMatrix copy()

      Returns a (deep) copy of this.
      Specified by:
        `copy` in interface `RealMatrix`
      Specified by:
        `copy` in class `AbstractRealMatrix`
      Returns:
        matrix copy

    - #### createMatrix

          public OpenMapRealMatrix createMatrix(int rowDimension,
                                       int columnDimension)
                                         throws NotStrictlyPositiveException,
                                                NumberIsTooLargeException

      Create a new RealMatrix of the same type as the instance with the supplied row and column dimensions.
      Specified by:
        `createMatrix` in interface `RealMatrix`
      Specified by:
        `createMatrix` in class `AbstractRealMatrix`
      Parameters:
        `rowDimension` - the number of rows in the new matrix
        `columnDimension` - the number of columns in the new matrix
      Returns:
        a new matrix of the same type as the instance
      Throws:
        `NumberIsTooLargeException` - if the total number of entries of the matrix is larger than `Integer.MAX_VALUE`.
        `NotStrictlyPositiveException` - if row or column dimension is not positive.

    - #### getColumnDimension

          public int getColumnDimension()

      Returns the number of columns of this matrix.
      Specified by:
        `getColumnDimension` in interface `AnyMatrix`
      Specified by:
        `getColumnDimension` in class `AbstractRealMatrix`
      Returns:
        the number of columns.

    - #### add

          public OpenMapRealMatrix add(OpenMapRealMatrix m)
                                throws MatrixDimensionMismatchException

      Compute the sum of this matrix and `m`.
      Parameters:
        `m` - Matrix to be added.
      Returns:
        `this` + `m`.
      Throws:
        `MatrixDimensionMismatchException` - if `m` is not the same size as `this`.

    - #### subtract

          public OpenMapRealMatrix subtract(RealMatrix m)
                                     throws MatrixDimensionMismatchException

      Returns `this` minus `m`.
      Specified by:
        `subtract` in interface `RealMatrix`
      Overrides:
        `subtract` in class `AbstractRealMatrix`
      Parameters:
        `m` - matrix to be subtracted
      Returns:
        `this - m`
      Throws:
        `MatrixDimensionMismatchException` - if `m` is not the same size as `this`.

    - #### subtract

          public OpenMapRealMatrix subtract(OpenMapRealMatrix m)
                                     throws MatrixDimensionMismatchException

      Subtract `m` from this matrix.
      Parameters:
        `m` - Matrix to be subtracted.
      Returns:
        `this` - `m`.
      Throws:
        `MatrixDimensionMismatchException` - if `m` is not the same size as `this`.

    - #### multiply

          public RealMatrix multiply(RealMatrix m)
                              throws DimensionMismatchException,
                                     NumberIsTooLargeException

      Returns the result of postmultiplying `this` by `m`.
      Specified by:
        `multiply` in interface `RealMatrix`
      Overrides:
        `multiply` in class `AbstractRealMatrix`
      Parameters:
        `m` - matrix to postmultiply by
      Returns:
        `this * m`
      Throws:
        `NumberIsTooLargeException` - if `m` is an `OpenMapRealMatrix`, and the total number of entries of the product is larger than `Integer.MAX_VALUE`.
        `DimensionMismatchException` - if `columnDimension(this) != rowDimension(m)`

    - #### multiply

          public OpenMapRealMatrix multiply(OpenMapRealMatrix m)
                                     throws DimensionMismatchException,
                                            NumberIsTooLargeException

      Postmultiply this matrix by `m`.
      Parameters:
        `m` - Matrix to postmultiply by.
      Returns:
        `this` * `m`.
      Throws:
        `DimensionMismatchException` - if the number of rows of `m` differ from the number of columns of `this` matrix.
        `NumberIsTooLargeException` - if the total number of entries of the product is larger than `Integer.MAX_VALUE`.

    - #### getEntry

          public double getEntry(int row,
                        int column)
                          throws OutOfRangeException

      Get the entry in the specified row and column. Row and column indices start at 0.
      Specified by:
        `getEntry` in interface `RealMatrix`
      Specified by:
        `getEntry` in class `AbstractRealMatrix`
      Parameters:
        `row` - Row index of entry to be fetched.
        `column` - Column index of entry to be fetched.
      Returns:
        the matrix entry at `(row, column)`.
      Throws:
        `OutOfRangeException` - if the row or column index is not valid.

    - #### getRowDimension

          public int getRowDimension()

      Returns the number of rows of this matrix.
      Specified by:
        `getRowDimension` in interface `AnyMatrix`
      Specified by:
        `getRowDimension` in class `AbstractRealMatrix`
      Returns:
        the number of rows.

    - #### setEntry

          public void setEntry(int row,
                      int column,
                      double value)
                        throws OutOfRangeException

      Set the entry in the specified row and column. Row and column indices start at 0.
      Specified by:
        `setEntry` in interface `RealMatrix`
      Specified by:
        `setEntry` in class `AbstractRealMatrix`
      Parameters:
        `row` - Row index of entry to be set.
        `column` - Column index of entry to be set.
        `value` - the new value of the entry.
      Throws:
        `OutOfRangeException` - if the row or column index is not valid

    - #### addToEntry

          public void addToEntry(int row,
                        int column,
                        double increment)
                          throws OutOfRangeException

      Adds (in place) the specified value to the specified entry of `this` matrix. Row and column indices start at 0.
      Specified by:
        `addToEntry` in interface `RealMatrix`
      Overrides:
        `addToEntry` in class `AbstractRealMatrix`
      Parameters:
        `row` - Row index of the entry to be modified.
        `column` - Column index of the entry to be modified.
        `increment` - value to add to the matrix entry.
      Throws:
        `OutOfRangeException` - if the row or column index is not valid.

    - #### multiplyEntry

          public void multiplyEntry(int row,
                           int column,
                           double factor)
                             throws OutOfRangeException

      Multiplies (in place) the specified entry of `this` matrix by the specified value. Row and column indices start at 0.
      Specified by:
        `multiplyEntry` in interface `RealMatrix`
      Overrides:
        `multiplyEntry` in class `AbstractRealMatrix`
      Parameters:
        `row` - Row index of the entry to be modified.
        `column` - Column index of the entry to be modified.
        `factor` - Multiplication factor for the matrix entry.
      Throws:
        `OutOfRangeException` - if the row or column index is not valid.

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