KernelMatrix Class Reference

#include <kernel-matrix.h>

List of all members.

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Detailed Description

Data structure for a square symmetric matrix.

Public Member Functions
	KernelMatrix ()
	Creates an empty (0x0) matrix.
	KernelMatrix (int size)
	Creates a (size x size) identity matrix.
int	size () const
	Gets the current size of the matrix.
void	Normalize ()
	Normalizes by dividing k[r][c] by sqrt(k[r][r] * k[c][c]).
void	NormalizeByMinCardinality (const vector< int > &cards)
	Normalize by min cardinality.
void	Resize (int new_size)
	Resizes the matrix.
double &	at (int row, int col)
	Get a ref to the kernel value at row, col.
double	at (int row, int col) const
	Get the kernel value at row, col.
void	WriteToStream (ostream &output_stream) const
	Write the matrix to a stream.
void	WriteToFile (const char *filename) const
	Write the matrix to a stream.
void	ReadFromStream (istream &input_stream)
	Replaces all data in this matrix with new data from the stream.
void	ReadFromFile (const char *filename)
	Replaces all data in this matrix with new data from the file.

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Constructor & Destructor Documentation

KernelMatrix

(

)

[inline]

Creates an empty (0x0) matrix.

KernelMatrix

(

int

size

)

Creates a (size x size) identity matrix.

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Member Function Documentation

int size

(

)

const

Gets the current size of the matrix.

void Normalize

(

)

Normalizes by dividing k[r][c] by sqrt(k[r][r] * k[c][c]).

void NormalizeByMinCardinality

(

const vector< int > &

cards

)

Normalize by min cardinality.

Requires cards.size() == size(). cards[i] is the cardinality of the ith set. This function will divide k[r][c] by the minimum of cards[r] and cards[c].

See also:

PointSetList::GetSetCardinalities()

void Resize

(

int

new_size

)

Resizes the matrix.

Warning: this can cause data loss if you are shrinking the matrix. If rows are added, any new elements on the diagonal are initialized to 1, all other new elements are 0.

double & at	(	int	row,
		int	col
	)

Get a ref to the kernel value at row, col.

This allows you to do things like kernel.at(1, 3) = 37; KernelMatrix will automatically maintain symmetry, so that after you do this, if you call kernel.at(3, 1), it will be 37.

double at	(	int	row,
		int	col
	)			const

Get the kernel value at row, col.

void WriteToStream

(

ostream &

output_stream

)

const

Write the matrix to a stream.

File format:

• (int32) N, the number of rows (and cols)
• (1 * double) row 0 (just k[0][0])
• (2 * double) row 1
• ...
• (N * double) row N-1

Aborts if the stream is bad.

void WriteToFile

(

const char *

filename

)

const

Write the matrix to a stream.

See also:

WriteToStream

void ReadFromStream

(

istream &

input_stream

)

Replaces all data in this matrix with new data from the stream.

Aborts if the stream is bad. See WriteToStream() for the file format.

See also:

WriteToStream()

void ReadFromFile

(

const char *

filename

)

Replaces all data in this matrix with new data from the file.

See also:

ReadFromStream

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The documentation for this class was generated from the following files:

• kernel/kernel-matrix.h
• kernel/kernel-matrix.cc

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