Matrix64F
org.ejml.data

Class Matrix64F

    • Field Summary

      Fields 
      Modifier and TypeField and Description
      intnumCols
      Number of columns in the matrix.
      intnumRows
      Number of rows in the matrix.
    • Constructor Summary

      Constructors 
      Constructor and Description
      Matrix64F() 
    • Method Summary

      Methods 
      Modifier and TypeMethod and Description
      abstract <T extends Matrix64F
      T
      copy() 
      abstract doubleget(int row, int col)
      Returns the value of value of the specified matrix element.
      intgetNumCols()
      Returns the number of columns in this matrix.
      abstract intgetNumElements()
      Returns the number of elements in this matrix, which is the number of rows times the number of columns.
      intgetNumRows()
      Returns the number of rows in this matrix.
      MatrixIteratoriterator(boolean rowMajor, int minRow, int minCol, int maxRow, int maxCol)
      Creates a new iterator for traversing through a submatrix inside this matrix.
      abstract voidprint() 
      voidreshape(int numRows, int numCols)
      Equivalent to invoking reshape(numRows,numCols,false);
      abstract voidreshape(int numRows, int numCols, boolean saveValues)
      Changes the number of rows and columns in the matrix, allowing its size to grow or shrink.
      abstract voidset(int row, int col, double val)
      Sets the value of the specified matrix element.
      voidset(Matrix64F A)
      Assigns the value of 'this' matrix to be the same as 'A'.
      abstract doubleunsafe_get(int row, int col)
      Same as get(int, int) but does not perform bounds check on input parameters.
      abstract voidunsafe_set(int row, int col, double val)
      Same as set(int, int, double) but does not perform bounds check on input parameters.
    • Field Detail

      • numRows

        public int numRows
        Number of rows in the matrix.
      • numCols

        public int numCols
        Number of columns in the matrix.
    • Constructor Detail

      • Matrix64F

        public Matrix64F()
    • Method Detail

      • reshape

        public abstract void reshape(int numRows,           int numCols,           boolean saveValues)

        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 ]

        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)
        Equivalent to invoking reshape(numRows,numCols,false);
        Parameters:
        numRows - The new number of rows in the matrix.
        numCols - The new number of columns in the matrix.
      • get

        public abstract double get(int row,         int col)
        Returns the value of value of the specified matrix element.
        Parameters:
        row - Matrix element's row index..
        col - Matrix element's column index.
        Returns:
        The specified element's value.
      • unsafe_get

        public abstract double unsafe_get(int row,                int col)
        Same as 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.
        Parameters:
        row - Matrix element's row index..
        col - Matrix element's column index.
        Returns:
        The specified element's value.
      • set

        public abstract void set(int row,       int col,       double val)
        Sets the value of the specified matrix element.
        Parameters:
        row - Matrix element's row index..
        col - Matrix element's column index.
        val - The element's new value.
      • unsafe_set

        public abstract void unsafe_set(int row,              int col,              double val)
        Same as 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.
        Parameters:
        row - Matrix element's row index..
        col - Matrix element's column index.
        val - The element's new value.
      • iterator

        public MatrixIterator iterator(boolean rowMajor,                      int minRow,                      int minCol,                      int maxRow,                      int maxCol)
        Creates a new iterator for traversing through a submatrix inside this matrix. It can be traversed by row or by column. Range of elements is inclusive, e.g. minRow = 0 and maxRow = 1 will include rows 0 and 1. The iteration starts at (minRow,minCol) and ends at (maxRow,maxCol)
        Parameters:
        rowMajor - true means it will traverse through the submatrix by row first, false by columns.
        minRow - first row it will start at.
        minCol - first column it will start at.
        maxRow - last row it will stop at.
        maxCol - last column it will stop at.
        Returns:
        A new MatrixIterator
      • getNumRows

        public int getNumRows()
        Returns the number of rows in this matrix.
        Returns:
        Number of rows.
      • getNumCols

        public int getNumCols()
        Returns the number of columns in this matrix.
        Returns:
        Number of columns.
      • getNumElements

        public abstract int getNumElements()
        Returns the number of elements in this matrix, which is the number of rows times the number of columns.
        Returns:
        Number of elements in this matrix.
      • set

        public void set(Matrix64F A)
        Assigns the value of 'this' matrix to be the same as 'A'. The shape of both matrices must be the same.
        Parameters:
        A - The matrix whose value is to be copied into 'this'.
      • copy

        public abstract <T extends Matrix64F> T copy()
      • print

        public abstract void print()

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