BlockMatrix64F
org.ejml.data

Class BlockMatrix64F

    • Field Detail

      • blockLength

        public int blockLength
    • Constructor Detail

      • BlockMatrix64F

        public BlockMatrix64F(int numRows,              int numCols,              int blockLength)
      • BlockMatrix64F

        public BlockMatrix64F(int numRows,              int numCols)
      • BlockMatrix64F

        public BlockMatrix64F()
    • Method Detail

      • wrap

        public static BlockMatrix64F wrap(double[] data,                  int numRows,                  int numCols,                  int blockLength)
      • getData

        public double[] getData()
        Description copied from class: D1Matrix64F
        Used to get a reference to the internal data.
        Overrides:
        getData in class D1Matrix64F
        Returns:
        Reference to the matrix's data.
      • reshape

        public void reshape(int numRows,           int numCols,           boolean saveValues)
        Description copied from class: Matrix64F

        Changes the number of rows and columns in the matrix, allowing its size to grow or shrink. If the saveValues flag is set to true, then the previous values will be maintained, but reassigned to new elements in a row-major ordering. If saveValues is false values will only be maintained when the requested size is less than or equal to the internal array size. The primary use for this function is to encourage data reuse and avoid unnecessarily declaring and initialization of new memory.

        Examples:
        [ 1 2 ; 3 4 ] -> reshape( 2 , 3 , true ) = [ 1 2 3 ; 4 0 0 ]
        [ 1 2 ; 3 4 ] -> reshape( 1 , 2 , true ) = [ 1 2 ]
        [ 1 2 ; 3 4 ] -> reshape( 1 , 2 , false ) = [ 1 2 ]
        [ 1 2 ; 3 4 ] -> reshape( 2 , 3 , false ) = [ 0 0 0 ; 0 0 0 ]

        Specified by:
        reshape in class Matrix64F
        Parameters:
        numRows - The new number of rows in the matrix.
        numCols - The new number of columns in the matrix.
        saveValues - If true then the value of each element will be save using a row-major reordering. Typically this should be false.
      • reshape

        public void reshape(int numRows,           int numCols,           int blockLength,           boolean saveValues)
      • getIndex

        public int getIndex(int row,           int col)
        Description copied from class: D1Matrix64F
        Returns the internal array index for the specified row and column.
        Specified by:
        getIndex in class D1Matrix64F
        Parameters:
        row - Row index.
        col - Column index.
        Returns:
        Internal array index.
      • get

        public double get(int row,         int col)
        Description copied from class: Matrix64F
        Returns the value of value of the specified matrix element.
        Specified by:
        get in class Matrix64F
        Parameters:
        row - Matrix element's row index..
        col - Matrix element's column index.
        Returns:
        The specified element's value.
      • unsafe_get

        public double unsafe_get(int row,                int col)
        Description copied from class: Matrix64F
        Same as Matrix64F.get(int, int) but does not perform bounds check on input parameters. This results in about a 25% speed increase but potentially sacrifices stability and makes it more difficult to track down simple errors. It is not recommended that this function be used, except in highly optimized code where the bounds are implicitly being checked.
        Specified by:
        unsafe_get in class Matrix64F
        Parameters:
        row - Matrix element's row index..
        col - Matrix element's column index.
        Returns:
        The specified element's value.
      • set

        public void set(int row,       int col,       double val)
        Description copied from class: Matrix64F
        Sets the value of the specified matrix element.
        Specified by:
        set in class Matrix64F
        Parameters:
        row - Matrix element's row index..
        col - Matrix element's column index.
        val - The element's new value.
      • unsafe_set

        public void unsafe_set(int row,              int col,              double val)
        Description copied from class: Matrix64F
        Same as Matrix64F.set(int, int, double) but does not perform bounds check on input parameters. This results in about a 25% speed increase but potentially sacrifices stability and makes it more difficult to track down simple errors. It is not recommended that this function be used, except in highly optimized code where the bounds are implicitly being checked.
        Specified by:
        unsafe_set in class Matrix64F
        Parameters:
        row - Matrix element's row index..
        col - Matrix element's column index.
        val - The element's new value.
      • getNumRows

        public int getNumRows()
        Description copied from class: Matrix64F
        Returns the number of rows in this matrix.
        Overrides:
        getNumRows in class Matrix64F
        Returns:
        Number of rows.
      • getNumCols

        public int getNumCols()
        Description copied from class: Matrix64F
        Returns the number of columns in this matrix.
        Overrides:
        getNumCols in class Matrix64F
        Returns:
        Number of columns.
      • getNumElements

        public int getNumElements()
        Description copied from class: Matrix64F
        Returns the number of elements in this matrix, which is the number of rows times the number of columns.
        Specified by:
        getNumElements in class Matrix64F
        Returns:
        Number of elements in this matrix.

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