jv.vecmath

Interface PdMatrixIf

All Known Implementing Classes:

PdMatrix, PnMassMatrix, PnSparseMatrix, PnStiffAniso, PnStiffConformal, PnStiffDiriConforming, PnStiffDiriNonConforming, PnStiffMatrix, PnStiffSpring

public interface PdMatrixIf

Basic interface to matrices enables simultaneous use of full and sparse matrices.

Beta version.

See Also:

PdMatrix

Author:

Konrad Polthier, Christoph von Tycowicz

Version:

20.03.10, 1.00 revised (kp)
20.03.10, 1.00 created (kp, cvt)

Method Summary

Modifier and Type	Method and Description
void	addEntry(int i, int j, double inc) Add value to component of matrix, and possibly enlarge matrix if too small.
void	clear() Set all elements of the matrix to 0.
double	getEntry(int i, int j) Get the component of matrix.
int	getNumCols() Get number of columns of matrix.
int	getNumRows() Get number of rows of matrix.
boolean	isSquare() Check if matrix is square.
PdVector	leftMultMatrix(PdVector out, PdVector in) Multiply this matrix with vector and fill output vector, out = this*in.
double	multQuadratic(PdVector left, PdVector right) Compute left^T*this*right.
void	multScalar(double scalar) Multiply all matrix components with scalar.
PdVector	rightMultMatrix(PdVector out, PdVector in) Multiply this matrix with vector and fill output vector, out = in*this.
void	setEntry(int i, int j, double value) Assign value to component of matrix, and possibly enlarge matrix if too small.
void	transpose() Transpose a square matrix, this = transpose(this).

Method Detail

getNumCols

int getNumCols()

Get number of columns of matrix.

getNumRows

int getNumRows()

Get number of rows of matrix.

getEntry

double getEntry(int i,
                int j)

Get the component of matrix.

setEntry

void setEntry(int i,
              int j,
              double value)

Assign value to component of matrix, and possibly enlarge matrix if too small.

addEntry

void addEntry(int i,
              int j,
              double inc)

Add value to component of matrix, and possibly enlarge matrix if too small.

multScalar

void multScalar(double scalar)

Multiply all matrix components with scalar.

leftMultMatrix

PdVector leftMultMatrix(PdVector out,
                        PdVector in)

Multiply this matrix with vector and fill output vector, out = this*in.. Matrix need not be square. Input vector must have same size as number of columns of this matrix. Method modifies size of output vector to number of rows of this matrix. If output vector is null then it is created.

rightMultMatrix

PdVector rightMultMatrix(PdVector out,
                         PdVector in)

Multiply this matrix with vector and fill output vector, out = in*this.. Matrix need not be square. Input vector must have same size as number of rows of this matrix. Method modifies size of output vector to number of columns of this matrix. If output vector is null then it is created.

multQuadratic

double multQuadratic(PdVector left,
                     PdVector right)

Compute left^T*this*right. The matrix is interpreted as a quadratic form.

Parameters:

left - The left argument.

right - The right argument.

Returns:

left^T*this*right.

isSquare

boolean isSquare()

Check if matrix is square.

transpose

void transpose()

Transpose a square matrix, this = transpose(this).

clear

void clear()

Set all elements of the matrix to 0.