org.apache.commons.math.linear

Class Array2DRowRealMatrix

java.lang.Object

org.apache.commons.math.linear.AbstractRealMatrix

org.apache.commons.math.linear.Array2DRowRealMatrix

All Implemented Interfaces:

java.io.Serializable, AnyMatrix, RealMatrix

public class Array2DRowRealMatrix
extends AbstractRealMatrix
implements java.io.Serializable

Implementation of RealMatrix using a double[][] array to store entries and LU decomposition to support linear system solution and inverse.

The LU decomposition is performed as needed, to support the following operations:

• solve
• isSingular
• getDeterminant
• inverse

Usage notes:

• The LU decomposition is cached and reused on subsequent calls. If data are modified via references to the underlying array obtained using getDataRef(), then the stored LU decomposition will not be discarded. In this case, you need to explicitly invoke LUDecompose() to recompute the decomposition before using any of the methods above.
• As specified in the RealMatrix interface, matrix element indexing is 0-based -- e.g., getEntry(0, 0) returns the element in the first row, first column of the matrix.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
Array2DRowRealMatrix() Creates a matrix with no data
Array2DRowRealMatrix(double[] v) Create a new (column) RealMatrix using v as the data for the unique column of the v.length x 1 matrix created.
Array2DRowRealMatrix(double[][] d) Create a new RealMatrix using the input array as the underlying data array.
Array2DRowRealMatrix(double[][] d, boolean copyArray) Create a new RealMatrix using the input array as the underlying data array.
Array2DRowRealMatrix(int rowDimension, int columnDimension) Create a new RealMatrix with the supplied row and column dimensions.

Method Summary

Modifier and Type	Method and Description
Array2DRowRealMatrix	add(Array2DRowRealMatrix m) Compute the sum of this and m.
RealMatrix	add(RealMatrix m) Compute the sum of this and m.
void	addToEntry(int row, int column, double increment) Change an entry in the specified row and column.
RealMatrix	copy() Returns a (deep) copy of this.
RealMatrix	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 in the matrix.
double[][]	getData() Returns matrix entries as a two-dimensional array.
double[][]	getDataRef() Returns a reference to the underlying data array.
double	getEntry(int row, int column) Returns the entry in the specified row and column.
int	getRowDimension() Returns the number of rows in the matrix.
Array2DRowRealMatrix	multiply(Array2DRowRealMatrix m) Returns the result of postmultiplying this by m.
RealMatrix	multiply(RealMatrix m) Returns the result of postmultiplying this by m.
void	multiplyEntry(int row, int column, double factor) Change an entry in the specified row and column.
double[]	operate(double[] v) Returns the result of multiplying this by the vector v.
double[]	preMultiply(double[] v) Returns the (row) vector result of premultiplying this by the vector v.
void	setEntry(int row, int column, double value) Set the entry in the specified row and column.
void	setSubMatrix(double[][] subMatrix, int row, int column) Replace the submatrix starting at row, column using data in the input subMatrix array.
Array2DRowRealMatrix	subtract(Array2DRowRealMatrix m) Compute this minus m.
RealMatrix	subtract(RealMatrix m) Compute this minus m.
double	walkInColumnOrder(RealMatrixChangingVisitor visitor) Visit (and possibly change) all matrix entries in column order.
double	walkInColumnOrder(RealMatrixChangingVisitor visitor, int startRow, int endRow, int startColumn, int endColumn) Visit (and possibly change) some matrix entries in column order.
double	walkInColumnOrder(RealMatrixPreservingVisitor visitor) Visit (but don't change) all matrix entries in column order.
double	walkInColumnOrder(RealMatrixPreservingVisitor visitor, int startRow, int endRow, int startColumn, int endColumn) Visit (but don't change) some matrix entries in column order.
double	walkInRowOrder(RealMatrixChangingVisitor visitor) Visit (and possibly change) all matrix entries in row order.
double	walkInRowOrder(RealMatrixChangingVisitor visitor, int startRow, int endRow, int startColumn, int endColumn) Visit (and possibly change) some matrix entries in row order.
double	walkInRowOrder(RealMatrixPreservingVisitor visitor) Visit (but don't change) all matrix entries in row order.
double	walkInRowOrder(RealMatrixPreservingVisitor visitor, int startRow, int endRow, int startColumn, int endColumn) Visit (but don't change) some matrix entries in row order.

Methods inherited from class org.apache.commons.math.linear.AbstractRealMatrix

copySubMatrix, copySubMatrix, equals, getColumn, getColumnMatrix, getColumnVector, getDeterminant, getFrobeniusNorm, getNorm, getRow, getRowMatrix, getRowVector, getSubMatrix, getSubMatrix, getTrace, hashCode, inverse, isSingular, isSquare, luDecompose, operate, preMultiply, preMultiply, scalarAdd, scalarMultiply, setColumn, setColumnMatrix, setColumnVector, setRow, setRowMatrix, setRowVector, solve, solve, toString, transpose, walkInOptimizedOrder, walkInOptimizedOrder, walkInOptimizedOrder, walkInOptimizedOrder

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Array2DRowRealMatrix

public Array2DRowRealMatrix()

Creates a matrix with no data

Array2DRowRealMatrix

public Array2DRowRealMatrix(int rowDimension,
                            int columnDimension)
                     throws java.lang.IllegalArgumentException

Create a new RealMatrix with the supplied row and column dimensions.

Parameters:

rowDimension - the number of rows in the new matrix

columnDimension - the number of columns in the new matrix

Throws:

java.lang.IllegalArgumentException - if row or column dimension is not positive

Array2DRowRealMatrix

public Array2DRowRealMatrix(double[][] d)
                     throws java.lang.IllegalArgumentException,
                            java.lang.NullPointerException

Create a new RealMatrix using the input array as the underlying data array.

The input array is copied, not referenced. This constructor has the same effect as calling Array2DRowRealMatrix(double[][], boolean) with the second argument set to true.

Parameters:

d - data for new matrix

Throws:

java.lang.IllegalArgumentException - if d is not rectangular (not all rows have the same length) or empty

java.lang.NullPointerException - if d is null

See Also:

Array2DRowRealMatrix(double[][], boolean)

Array2DRowRealMatrix

public Array2DRowRealMatrix(double[][] d,
                            boolean copyArray)
                     throws java.lang.IllegalArgumentException,
                            java.lang.NullPointerException

Create a new RealMatrix using the input array as the underlying data array.

If an array is built specially in order to be embedded in a RealMatrix and not used directly, the copyArray may be set to false

Parameters:

d - data for new matrix

copyArray - if true, the input array will be copied, otherwise it will be referenced

Throws:

java.lang.IllegalArgumentException - if d is not rectangular (not all rows have the same length) or empty

java.lang.NullPointerException - if d is null

See Also:

Array2DRowRealMatrix(double[][])

Array2DRowRealMatrix

public Array2DRowRealMatrix(double[] v)

Create a new (column) RealMatrix using v as the data for the unique column of the v.length x 1 matrix created.

The input array is copied, not referenced.

Parameters:

v - column vector holding data for new matrix

Method Detail

createMatrix

public RealMatrix createMatrix(int rowDimension,
                               int columnDimension)
                        throws java.lang.IllegalArgumentException

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:

java.lang.IllegalArgumentException - if row or column dimension is not positive

copy

public RealMatrix copy()

Returns a (deep) copy of this.

Specified by:

copy in interface RealMatrix

Specified by:

copy in class AbstractRealMatrix

Returns:

matrix copy

add

public RealMatrix add(RealMatrix m)
               throws java.lang.IllegalArgumentException

Compute the sum of this and m.

Specified by:

add in interface RealMatrix

Overrides:

add in class AbstractRealMatrix

Parameters:

m - matrix to be added

Returns:

this + m

Throws:

java.lang.IllegalArgumentException - if m is not the same size as this

add

public Array2DRowRealMatrix add(Array2DRowRealMatrix m)
                         throws java.lang.IllegalArgumentException

Compute the sum of this and m.

Parameters:

m - matrix to be added

Returns:

this + m

Throws:

java.lang.IllegalArgumentException - if m is not the same size as this

subtract

public RealMatrix subtract(RealMatrix m)
                    throws java.lang.IllegalArgumentException

Compute this minus m.

Specified by:

subtract in interface RealMatrix

Overrides:

subtract in class AbstractRealMatrix

Parameters:

m - matrix to be subtracted

Returns:

this - m

Throws:

java.lang.IllegalArgumentException - if m is not the same size as this

subtract

public Array2DRowRealMatrix subtract(Array2DRowRealMatrix m)
                              throws java.lang.IllegalArgumentException

Compute this minus m.

Parameters:

m - matrix to be subtracted

Returns:

this + m

Throws:

java.lang.IllegalArgumentException - if m is not the same size as this

multiply

public RealMatrix multiply(RealMatrix m)
                    throws java.lang.IllegalArgumentException

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:

java.lang.IllegalArgumentException - if columnDimension(this) != rowDimension(m)

multiply

public Array2DRowRealMatrix multiply(Array2DRowRealMatrix m)
                              throws java.lang.IllegalArgumentException

Returns the result of postmultiplying this by m.

Parameters:

m - matrix to postmultiply by

Returns:

this*m

Throws:

java.lang.IllegalArgumentException - if columnDimension(this) != rowDimension(m)

getData

public double[][] getData()

Returns matrix entries as a two-dimensional array.

Specified by:

getData in interface RealMatrix

Overrides:

getData in class AbstractRealMatrix

Returns:

2-dimensional array of entries

getDataRef

public double[][] getDataRef()

Returns a reference to the underlying data array.

Does not make a fresh copy of the underlying data.

Returns:

2-dimensional array of entries

setSubMatrix

public void setSubMatrix(double[][] subMatrix,
                         int row,
                         int column)
                  throws MatrixIndexException

Replace the submatrix starting at row, column using data in the input subMatrix array. Indexes are 0-based.

Example:
Starting with

 1  2  3  4
 5  6  7  8
 9  0  1  2
 

and subMatrix = {{3, 4} {5,6}}, invoking setSubMatrix(subMatrix,1,1)) will result in

 1  2  3  4
 5  3  4  8
 9  5  6  2
 

Specified by:

setSubMatrix in interface RealMatrix

Overrides:

setSubMatrix in class AbstractRealMatrix

Parameters:

subMatrix - array containing the submatrix replacement data

row - row coordinate of the top, left element to be replaced

column - column coordinate of the top, left element to be replaced

Throws:

MatrixIndexException - if subMatrix does not fit into this matrix from element in (row, column)

getEntry

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

Returns the entry in the specified row and column.

Row and column indices start at 0 and must satisfy

• 0 <= row < rowDimension
• 0 <= column < columnDimension

otherwise a MatrixIndexException is thrown.

Specified by:

getEntry in interface RealMatrix

Specified by:

getEntry in class AbstractRealMatrix

Parameters:

row - row location of entry to be fetched

column - column location of entry to be fetched

Returns:

matrix entry in row,column

Throws:

MatrixIndexException - if the row or column index is not valid

setEntry

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

Set the entry in the specified row and column.

Row and column indices start at 0 and must satisfy

• 0 <= row < rowDimension
• 0 <= column < columnDimension

otherwise a MatrixIndexException is thrown.

Specified by:

setEntry in interface RealMatrix

Specified by:

setEntry in class AbstractRealMatrix

Parameters:

row - row location of entry to be set

column - column location of entry to be set

value - matrix entry to be set in row,column

Throws:

MatrixIndexException - if the row or column index is not valid

addToEntry

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

Change an entry in the specified row and column.

Row and column indices start at 0 and must satisfy

• 0 <= row < rowDimension
• 0 <= column < columnDimension

otherwise a MatrixIndexException is thrown.

Specified by:

addToEntry in interface RealMatrix

Specified by:

addToEntry in class AbstractRealMatrix

Parameters:

row - row location of entry to be set

column - column location of entry to be set

increment - value to add to the current matrix entry in row,column

Throws:

MatrixIndexException - if the row or column index is not valid

multiplyEntry

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

Change an entry in the specified row and column.

Row and column indices start at 0 and must satisfy

• 0 <= row < rowDimension
• 0 <= column < columnDimension

otherwise a MatrixIndexException is thrown.

Specified by:

multiplyEntry in interface RealMatrix

Specified by:

multiplyEntry in class AbstractRealMatrix

Parameters:

row - row location of entry to be set

column - column location of entry to be set

factor - multiplication factor for the current matrix entry in row,column

Throws:

MatrixIndexException - if the row or column index is not valid

getRowDimension

public int getRowDimension()

Returns the number of rows in the matrix.

Specified by:

getRowDimension in interface AnyMatrix

Specified by:

getRowDimension in class AbstractRealMatrix

Returns:

rowDimension

getColumnDimension

public int getColumnDimension()

Returns the number of columns in the matrix.

Specified by:

getColumnDimension in interface AnyMatrix

Specified by:

getColumnDimension in class AbstractRealMatrix

Returns:

columnDimension

operate

public double[] operate(double[] v)
                 throws java.lang.IllegalArgumentException

Returns the result of multiplying this by the vector v.

Specified by:

operate in interface RealMatrix

Overrides:

operate in class AbstractRealMatrix

Parameters:

v - the vector to operate on

Returns:

this*v

Throws:

java.lang.IllegalArgumentException - if columnDimension != v.size()

preMultiply

public double[] preMultiply(double[] v)
                     throws java.lang.IllegalArgumentException

Returns the (row) vector result of premultiplying this by the vector v.

Specified by:

preMultiply in interface RealMatrix

Overrides:

preMultiply in class AbstractRealMatrix

Parameters:

v - the row vector to premultiply by

Returns:

v*this

Throws:

java.lang.IllegalArgumentException - if rowDimension != v.size()

walkInRowOrder

public double walkInRowOrder(RealMatrixChangingVisitor visitor)
                      throws MatrixVisitorException

Visit (and possibly change) all matrix entries in row order.

Row order starts at upper left and iterating through all elements of a row from left to right before going to the leftmost element of the next row.

Specified by:

walkInRowOrder in interface RealMatrix

Overrides:

walkInRowOrder in class AbstractRealMatrix

Parameters:

visitor - visitor used to process all matrix entries

Returns:

the value returned by RealMatrixChangingVisitor.end() at the end of the walk

Throws:

MatrixVisitorException - if the visitor cannot process an entry

See Also:

RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor), RealMatrix.walkInRowOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor, int, int, int, int)

walkInRowOrder

public double walkInRowOrder(RealMatrixPreservingVisitor visitor)
                      throws MatrixVisitorException

Visit (but don't change) all matrix entries in row order.

Row order starts at upper left and iterating through all elements of a row from left to right before going to the leftmost element of the next row.

Specified by:

walkInRowOrder in interface RealMatrix

Overrides:

walkInRowOrder in class AbstractRealMatrix

Parameters:

visitor - visitor used to process all matrix entries

Returns:

the value returned by RealMatrixPreservingVisitor.end() at the end of the walk

Throws:

MatrixVisitorException - if the visitor cannot process an entry

See Also:

RealMatrix.walkInRowOrder(RealMatrixChangingVisitor), RealMatrix.walkInRowOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor, int, int, int, int)

walkInRowOrder

public double walkInRowOrder(RealMatrixChangingVisitor visitor,
                             int startRow,
                             int endRow,
                             int startColumn,
                             int endColumn)
                      throws MatrixIndexException,
                             MatrixVisitorException

Visit (and possibly change) some matrix entries in row order.

Row order starts at upper left and iterating through all elements of a row from left to right before going to the leftmost element of the next row.

Specified by:

walkInRowOrder in interface RealMatrix

Overrides:

walkInRowOrder in class AbstractRealMatrix

Parameters:

visitor - visitor used to process all matrix entries

startRow - Initial row index

endRow - Final row index (inclusive)

startColumn - Initial column index

endColumn - Final column index

Returns:

the value returned by RealMatrixChangingVisitor.end() at the end of the walk

Throws:

MatrixIndexException - if the indices are not valid

MatrixVisitorException - if the visitor cannot process an entry

See Also:

RealMatrix.walkInRowOrder(RealMatrixChangingVisitor), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor, int, int, int, int)

walkInRowOrder

public double walkInRowOrder(RealMatrixPreservingVisitor visitor,
                             int startRow,
                             int endRow,
                             int startColumn,
                             int endColumn)
                      throws MatrixIndexException,
                             MatrixVisitorException

Visit (but don't change) some matrix entries in row order.

Row order starts at upper left and iterating through all elements of a row from left to right before going to the leftmost element of the next row.

Specified by:

walkInRowOrder in interface RealMatrix

Overrides:

walkInRowOrder in class AbstractRealMatrix

Parameters:

visitor - visitor used to process all matrix entries

startRow - Initial row index

endRow - Final row index (inclusive)

startColumn - Initial column index

endColumn - Final column index

Returns:

the value returned by RealMatrixPreservingVisitor.end() at the end of the walk

Throws:

MatrixIndexException - if the indices are not valid

MatrixVisitorException - if the visitor cannot process an entry

See Also:

RealMatrix.walkInRowOrder(RealMatrixChangingVisitor), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor), RealMatrix.walkInRowOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor, int, int, int, int)

walkInColumnOrder

public double walkInColumnOrder(RealMatrixChangingVisitor visitor)
                         throws MatrixVisitorException

Visit (and possibly change) all matrix entries in column order.

Column order starts at upper left and iterating through all elements of a column from top to bottom before going to the topmost element of the next column.

Specified by:

walkInColumnOrder in interface RealMatrix

Overrides:

walkInColumnOrder in class AbstractRealMatrix

Parameters:

visitor - visitor used to process all matrix entries

Returns:

the value returned by RealMatrixChangingVisitor.end() at the end of the walk

Throws:

MatrixVisitorException - if the visitor cannot process an entry

See Also:

RealMatrix.walkInRowOrder(RealMatrixChangingVisitor), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor), RealMatrix.walkInRowOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor, int, int, int, int)

walkInColumnOrder

public double walkInColumnOrder(RealMatrixPreservingVisitor visitor)
                         throws MatrixVisitorException

Visit (but don't change) all matrix entries in column order.

Column order starts at upper left and iterating through all elements of a column from top to bottom before going to the topmost element of the next column.

Specified by:

walkInColumnOrder in interface RealMatrix

Overrides:

walkInColumnOrder in class AbstractRealMatrix

Parameters:

visitor - visitor used to process all matrix entries

Returns:

the value returned by RealMatrixPreservingVisitor.end() at the end of the walk

Throws:

MatrixVisitorException - if the visitor cannot process an entry

See Also:

RealMatrix.walkInRowOrder(RealMatrixChangingVisitor), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor), RealMatrix.walkInRowOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor, int, int, int, int)

walkInColumnOrder

public double walkInColumnOrder(RealMatrixChangingVisitor visitor,
                                int startRow,
                                int endRow,
                                int startColumn,
                                int endColumn)
                         throws MatrixIndexException,
                                MatrixVisitorException

Visit (and possibly change) some matrix entries in column order.

Column order starts at upper left and iterating through all elements of a column from top to bottom before going to the topmost element of the next column.

Specified by:

walkInColumnOrder in interface RealMatrix

Overrides:

walkInColumnOrder in class AbstractRealMatrix

Parameters:

visitor - visitor used to process all matrix entries

startRow - Initial row index

endRow - Final row index (inclusive)

startColumn - Initial column index

endColumn - Final column index

Returns:

the value returned by RealMatrixChangingVisitor.end() at the end of the walk

Throws:

MatrixIndexException - if the indices are not valid

MatrixVisitorException - if the visitor cannot process an entry

See Also:

RealMatrix.walkInRowOrder(RealMatrixChangingVisitor), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor), RealMatrix.walkInRowOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor, int, int, int, int)

walkInColumnOrder

public double walkInColumnOrder(RealMatrixPreservingVisitor visitor,
                                int startRow,
                                int endRow,
                                int startColumn,
                                int endColumn)
                         throws MatrixIndexException,
                                MatrixVisitorException

Visit (but don't change) some matrix entries in column order.

Column order starts at upper left and iterating through all elements of a column from top to bottom before going to the topmost element of the next column.

Specified by:

walkInColumnOrder in interface RealMatrix

Overrides:

walkInColumnOrder in class AbstractRealMatrix

Parameters:

visitor - visitor used to process all matrix entries

startRow - Initial row index

endRow - Final row index (inclusive)

startColumn - Initial column index

endColumn - Final column index

Returns:

the value returned by RealMatrixPreservingVisitor.end() at the end of the walk

Throws:

MatrixIndexException - if the indices are not valid

MatrixVisitorException - if the visitor cannot process an entry

See Also:

RealMatrix.walkInRowOrder(RealMatrixChangingVisitor), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor), RealMatrix.walkInRowOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInRowOrder(RealMatrixPreservingVisitor, int, int, int, int), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor), RealMatrix.walkInColumnOrder(RealMatrixPreservingVisitor), RealMatrix.walkInColumnOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor), RealMatrix.walkInOptimizedOrder(RealMatrixChangingVisitor, int, int, int, int), RealMatrix.walkInOptimizedOrder(RealMatrixPreservingVisitor, int, int, int, int)