fsqmat Class Reference

Fake sqmat. This class maps sqmat operations to operations on full matrix. More...

#include <libDC.h>

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List of all members.

Public Member Functions

void opupdt (const vec &v, double w)
mat to_mat ()
 Conversion to full matrix.
void mult_sym (const mat &C)
 Inplace symmetric multiplication by a SQUARE matrix $C$, i.e. $V = C*V*C'$.
void mult_sym_t (const mat &C)
 Inplace symmetric multiplication by a SQUARE transpose of matrix $C$, i.e. $V = C'*V*C$.
void mult_sym (const mat &C, fsqmat &U) const
 store result of mult_sym in external matrix $U$
void mult_sym_t (const mat &C, fsqmat &U) const
 store result of mult_sym_t in external matrix $U$
void clear ()
 Clearing matrix so that it corresponds to zeros.
 fsqmat ()
 Default initialization.
 fsqmat (const int dim0)
 Default initialization with proper size.
 fsqmat (const mat &M)
 Constructor.
virtual ~fsqmat ()
 Destructor for future use;.
virtual void inv (fsqmat &Inv)
 Matrix inversion preserving the chosen form.
double logdet () const
 Logarithm of a determinant.
double qform (const vec &v) const
 Evaluates quadratic form $x= v'*V*v$;.
vec sqrt_mult (const vec &v) const
 Multiplies square root of $V$ by vector $x$.
fsqmatoperator+= (const fsqmat &A)
 add another fsqmat matrix
fsqmatoperator-= (const fsqmat &A)
 subtrack another fsqmat matrix
fsqmatoperator *= (double x)
 multiply by a scalar
int cols () const
 Reimplementing common functions of mat: cols().
int rows () const
 Reimplementing common functions of mat: cols().

Protected Attributes

mat M
 Full matrix on which the operations are performed.
int dim
 dimension of the square matrix

Friends

std::ostream & operator<< (std::ostream &os, const fsqmat &sq)
 print full matrix


Detailed Description

Fake sqmat. This class maps sqmat operations to operations on full matrix.

This class can be used to compare performance of algorithms using decomposed matrices with perormance of the same algorithms using full matrices;


Member Function Documentation

void fsqmat::opupdt ( const vec &  v,
double  w 
) [virtual]

Perfroms a rank-1 update by outer product of vectors: $V = V + w v v'$.

Parameters:
v Vector forming the outer product to be added
w weight of updating; can be negative
BLAS-2b operation.

Implements sqmat.

void fsqmat::mult_sym ( const mat &  C  )  [virtual]

Inplace symmetric multiplication by a SQUARE matrix $C$, i.e. $V = C*V*C'$.

Parameters:
C multiplying matrix,

Implements sqmat.

void fsqmat::mult_sym_t ( const mat &  C  )  [virtual]

Inplace symmetric multiplication by a SQUARE transpose of matrix $C$, i.e. $V = C'*V*C$.

Parameters:
C multiplying matrix,

Implements sqmat.

void fsqmat::inv ( fsqmat Inv  )  [virtual]

Matrix inversion preserving the chosen form.

Parameters:
Inv a space where the inverse is stored.

vec fsqmat::sqrt_mult ( const vec &  v  )  const [inline, virtual]

Multiplies square root of $V$ by vector $x$.

Used e.g. in generating normal samples.

Implements sqmat.


The documentation for this class was generated from the following files:
Generated on Wed Mar 12 16:15:50 2008 for mixpp by  doxygen 1.5.3