shh.csparse
Class ElemMatrix

Object
  Matrix
      ElemMatrix

Direct Known Subclasses:

DNeg1Matrix, P2Matrix, TMatrix

public abstract class ElemMatrix

extends Matrix

The class of elementary matrices: permutations, dilations, and translations. All are invertible. In this implementation, they are immutable. Most matrix-ring operations are unsupported because they would produce non-elementary matrices in general.

To save space, we won't require ElemMatrixs to store their size. In particular, getNumRows() and getNumCols() are unsupported. We expect that ElemMatrixs will be used together with one particular "big" m × n matrix. The size of the ElemMatrixs, m × m or n × n, can be read from there. We don't check for size errors.

Author:

Mark McConnell

Constructor Summary

ElemMatrix()

Method Summary

Matrix	add(Matrix b) Unsupported.
abstract int	det() The determinant, as an int ±1.
int	getNumCols() Unsupported.
int	getNumRows() Unsupported.
boolean	isProductZero(Matrix b) Says whether this * b is zero, without storing the product.
boolean	isZero() Whether every entry in this matrix is zero.
abstract Matrix	multOnRight(Matrix b) Returns b * this.
void	set(SparseElt iAndVal, int j) Unsupported.

Methods inherited from class Matrix

get, inverse, isIdentity, mult, toString, transpose

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

ElemMatrix

public ElemMatrix()

Method Detail

add

public Matrix add(Matrix b)

Unsupported.

Specified by:

add in class Matrix

det

public abstract int det()

The determinant, as an int ±1.

getNumCols

public int getNumCols()

Unsupported.

Specified by:

getNumCols in class Matrix

getNumRows

public int getNumRows()

Unsupported.

Specified by:

getNumRows in class Matrix

isProductZero

public final boolean isProductZero(Matrix b)

Description copied from class: Matrix

Says whether this * b is zero, without storing the product. Is not destructive.

Specified by:

isProductZero in class Matrix

isZero

public final boolean isZero()

Description copied from class: Matrix

Whether every entry in this matrix is zero.

Specified by:

isZero in class Matrix

multOnRight

public abstract Matrix multOnRight(Matrix b)

Returns b * this. Check the implementation for whether it's destructive.

See Also:

Matrix.mult(shh.csparse.Matrix)

set

public final void set(SparseElt iAndVal,
                      int j)

Unsupported.

Specified by:

set in class Matrix