org.strbio.math
Class DHalfMatrix

java.lang.Object
  org.strbio.math.DVector
      org.strbio.math.DHalfMatrix

public class DHalfMatrix
extends DVector

like an upper triangular DMatrix. This pretends that you have a NxN matrix, but only allows access to elements in the upper triangular part (not including the diagonal). Allowed elements are of the form (i, i+1...n-1). You can access the data[] directly or call inherited methods from DVector, but you SHOULDN'T DO THIS.

Version:

1.0, 3/30/98

Author:

JMC

See Also:

DMatrix

Field Summary

Fields inherited from class org.strbio.math.DVector

data

Constructor Summary

DHalfMatrix()
Makes a new DHalfMatrix with no data.

DHalfMatrix(DHalfMatrix x)
This makes a DHalfMatrix from another one, making a separate copy of the data.

DHalfMatrix(int x)
This makes a new DHalfMatrix which is the upper triangular part of a square matrix.

Method Summary

int	cols() Returns the number of columns (of the theoretical whole matrix, not just the upper triangular part.
void	load(java.io.BufferedReader fp) Loads from an open BufferedReader.
void	print(PrintfStream outfile) Print nicely formatted data to a PrintfStream.
int	rows() Returns the number of rows (of the theoretical whole matrix, not just the upper triangular part.
void	setValueAt(int x, int y, double d) This allows you to set a value at column x, row y in the theoretical whole matrix.
double	valueAt(int x, int y) This allows you to get a value at column x, row y in the theoretical whole matrix.

Methods inherited from class org.strbio.math.DVector

add, add, append, append, average, averageRW, covar, cross, cross, dimension, distance, distance, divide, divide, dot, dot, equals, findNClosest, length, linearFit, load, makeZScores, max, median, min, multiply, multiply, multiply, multiply, multiply, multiply, norm, normalize, pearson, print, reverse, reverse, save, save, setValue, setValueAt, sort, stdev, stdevp, subtract, subtract, transform, valueAt, zScore

Methods inherited from class java.lang.Object

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

Constructor Detail

DHalfMatrix

public DHalfMatrix(int x)

This makes a new DHalfMatrix which is the upper triangular part of a square matrix. All elements are zero.

Parameters:

x - the number of rows and columns (x by x matrix)

DHalfMatrix

public DHalfMatrix()

Makes a new DHalfMatrix with no data. You can then load the data out of a file.

DHalfMatrix

public DHalfMatrix(DHalfMatrix x)

This makes a DHalfMatrix from another one, making a separate copy of the data.

Method Detail

rows

public final int rows()

Returns the number of rows (of the theoretical whole matrix, not just the upper triangular part.

cols

public final int cols()

Returns the number of columns (of the theoretical whole matrix, not just the upper triangular part.

valueAt

public final double valueAt(int x,
                            int y)

This allows you to get a value at column x, row y in the theoretical whole matrix. y must be greater than x, or you will probably get an ArrayOutOfBounds exception.

Parameters:

x - column number

y - row number

setValueAt

public final void setValueAt(int x,
                             int y,
                             double d)

This allows you to set a value at column x, row y in the theoretical whole matrix. y must be greater than x, or you will probably get an ArrayOutOfBounds exception.

Parameters:

x - column number

y - row number

d - double to store

print

public final void print(PrintfStream outfile)
                 throws java.io.IOException

Print nicely formatted data to a PrintfStream.

Throws:

java.io.IOException

load

public final void load(java.io.BufferedReader fp)
                throws java.io.IOException

Loads from an open BufferedReader. Other load and save functions are inherited from DVector, and work.

Overrides:

load in class DVector

Throws:

java.io.IOException

See Also:

DVector