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Class CH.epfl.lcvm.mccc.MatrixArray

java.lang.Object
   |
   +----CH.epfl.lcvm.mccc.MatrixArray

public class MatrixArray

extends Object

implements Matrix, Cloneable

MatrixArray(double[])

Create a column matrix from the given array

MatrixArray(double[][])

Create a matrix from the given array

MatrixArray(int, int)

Create an array with the given dimensions

add(Matrix)

Add the given matrix to the current matrix

copy()

So, it appears that clone doesn't really support polymorphic copying correctly (in java 1.1) so until it does we will use this...

copyColumns(int, int)

Slice the matrix columnise and return a copy of the specified columns

copyRows(int, int)

Slice the matrix rowise and return a copy of the specified rows

determinant()

Compute the determinant of the matrix

getColumns()

Get the number of columns

getElement(int, int)

Returns the element at the specified row and column

getRows()

Get the number of rows

infinityNorm()

Get the infinity norm of the matrix

main(String[])

Exercise the class by trying the various functions.

multiply(double)

Multiply the current matrix by the given scalar

multiply(Matrix)

Post multiply the current matrix by the given matrix

nullSpaceBasis()

Return a matrix whose columns are a basis of the null space of the matrix.

oneNorm()

Get the one norm of the matrix

random()

Fill in the matrix with random entries

setElement(int, int, double)

Sets the element at the specified row and column

solve(Matrix)

Solve the linear system AX=B and return X.

subtract(Matrix)

Subtract the given matrix from the current matrix

toArray()

Returns the native array representation of the matrix

toString()

Prints out the matrix

toVector()

Returns the native array representation of the matrix as a vector if it has exactly 1 column

transpose()

Transpose the current matrix

 public MatrixArray(int rows,
                    int columns)

Create an array with the given dimensions

Parameters:

row - The number of requested rows

column - The number of requested columns

 public MatrixArray(double input[])

Create a column matrix from the given array

Parameters:

input - Input array to make into a matrix

 public MatrixArray(double input[][])

Create a matrix from the given array

Parameters:

input - Input array to make into a matrix

 public void random()

Fill in the matrix with random entries

 public double getElement(int row,
                          int column)

Returns the element at the specified row and column

Parameters:

row - The row of the desired element

column - The column of the desired element

Returns:

the element at the specified coordinates.

 public void setElement(int row,
                        int column,
                        double value)

Sets the element at the specified row and column

Parameters:

row - The row of the desired element

column - The column of the desired element

value - The value to place into the array

 public void add(Matrix B)

Add the given matrix to the current matrix

Parameters:

B - The matrix to be added

 public void subtract(Matrix B)

Subtract the given matrix from the current matrix

Parameters:

B - The matrix to be added

 public void multiply(Matrix B)

Post multiply the current matrix by the given matrix

Parameters:

B - The matrix to be multiplied by

 public void transpose()

Transpose the current matrix

 public void multiply(double x)

Multiply the current matrix by the given scalar

Parameters:

x - The scalar to be multiplied by

 public double[][] toArray()

Returns the native array representation of the matrix

Returns:

A double[][] representation of the matrix

 public double[] toVector()

Returns the native array representation of the matrix as a vector if it has exactly 1 column

Returns:

A double[] representation of the matrix

 public String toString()

Prints out the matrix

Returns:

A string representation of the matrix

Overrides:

toString in class Object

 public int getRows()

Get the number of rows

Returns:

The number of rows

 public int getColumns()

Get the number of columns

Returns:

The number of columns

 public double oneNorm()

Get the one norm of the matrix

Returns:

The one norm of the matrix

 public double infinityNorm()

Get the infinity norm of the matrix

Returns:

The infinity norm of the matrix

 public Matrix solve(Matrix B) throws SolverException

Solve the linear system AX=B and return X. The method is up to the derived class. The solution matrix X has as many columns as B.

Returns:

The solution X

Throws: SolverException

for the solver

 public Matrix copy()

So, it appears that clone doesn't really support polymorphic copying correctly (in java 1.1) so until it does we will use this...

Returns:

A copy of the matrix

 public Matrix copyRows(int start,
                        int end)

Slice the matrix rowise and return a copy of the specified rows

Parameters:

start - The starting row

end - The ending row

Returns:

A copy of the matrix with just the given rows (inclusive)

 public Matrix copyColumns(int start,
                           int end)

Slice the matrix columnise and return a copy of the specified columns

Parameters:

start - The starting column

end - The ending column

Returns:

A copy of the matrix with just the given columns (inclusive)

 public double determinant() throws SolverException

Compute the determinant of the matrix

Returns:

The determinant of the matrix

Throws: SolverException

The exception thrown when the solver fails

 public Matrix nullSpaceBasis() throws MCCCException

Return a matrix whose columns are a basis of the null space of the matrix. Only guarenteed to work if the matrix is Nx(N+M) and has rank N.

Returns:

The basis of the null space.

Throws: MCCCException

The exception thrown when method fails

 public static void main(String argv[])

Exercise the class by trying the various functions.

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