com.itemanalysis.psychometrics.measurement

Class DiagonalMatrix

java.lang.Object

org.apache.commons.math3.linear.RealLinearOperator

org.apache.commons.math3.linear.AbstractRealMatrix

org.apache.commons.math3.linear.Array2DRowRealMatrix

com.itemanalysis.psychometrics.measurement.DiagonalMatrix

All Implemented Interfaces:

java.io.Serializable, org.apache.commons.math3.linear.AnyMatrix, org.apache.commons.math3.linear.RealMatrix

public class DiagonalMatrix
extends org.apache.commons.math3.linear.Array2DRowRealMatrix

A diagonal matrix. Off-diagonal elements are set to zero.

Author:

J. Patrick Meyer

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
DiagonalMatrix(double[] x) Creates a matrix with diagonal elements set to x.
DiagonalMatrix(org.apache.commons.math3.linear.RealMatrix matrix) Extracts the diagonal elements from a matrix.

Method Summary

Modifier and Type	Method and Description
void	setMatrix(double[] x) Changes the diagonal of the matrix to the values in x.

Methods inherited from class org.apache.commons.math3.linear.Array2DRowRealMatrix

add, addToEntry, copy, createMatrix, getColumnDimension, getData, getDataRef, getEntry, getRowDimension, multiply, multiplyEntry, operate, preMultiply, setEntry, setSubMatrix, subtract, walkInColumnOrder, walkInColumnOrder, walkInColumnOrder, walkInColumnOrder, walkInRowOrder, walkInRowOrder, walkInRowOrder, walkInRowOrder

Methods inherited from class org.apache.commons.math3.linear.AbstractRealMatrix

add, copySubMatrix, copySubMatrix, equals, getColumn, getColumnMatrix, getColumnVector, getFrobeniusNorm, getNorm, getRow, getRowMatrix, getRowVector, getSubMatrix, getSubMatrix, getTrace, hashCode, isSquare, multiply, operate, power, preMultiply, preMultiply, scalarAdd, scalarMultiply, setColumn, setColumnMatrix, setColumnVector, setRow, setRowMatrix, setRowVector, subtract, toString, transpose, walkInOptimizedOrder, walkInOptimizedOrder, walkInOptimizedOrder, walkInOptimizedOrder

Methods inherited from class org.apache.commons.math3.linear.RealLinearOperator

isTransposable, operateTranspose

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

DiagonalMatrix

public DiagonalMatrix(double[] x)

Creates a matrix with diagonal elements set to x. Off diagonal elements are zero.

Parameters:

x - diagonal values of the matrix

DiagonalMatrix

public DiagonalMatrix(org.apache.commons.math3.linear.RealMatrix matrix)

Extracts the diagonal elements from a matrix.

Parameters:

matrix - a matrix from which teh diagonal elements are extracted.

Method Detail

setMatrix

public void setMatrix(double[] x)

Changes the diagonal of the matrix to the values in x.

Parameters:

x - diagonal values of the matrix