# H.matrices: List of H Matrices In matrixcalc: Collection of functions for matrix calculations

## Description

This function constructs and returns a list of lists. The component of each sublist is derived from column vectors in an order r and order c identity matrix.

## Usage

 1 H.matrices(r, c = r) 

## Arguments

 r a positive integer value for an order r identity matrix c a positive integer value for an order c identify matrix

## Details

Let {{\bf{I}}_r} = ≤ft[ {\begin{array}{*{20}{c}} {{{\bf{a}}_1}}&{{{\bf{a}}_2}}& \cdots &{{{\bf{a}}_r}} \end{array}} \right] be the order r identity matrix with corresponding unit vectors {{{\bf{a}}_i}} with one in its ith position and zeros elsewhere. Let {{\bf{I}}_c} = ≤ft[ {\begin{array}{*{20}{c}} {{{\bf{b}}_1}}&{{{\bf{b}}_2}}& \cdots &{{{\bf{b}}_c}} \end{array}} \right] be the order c identity matrix with corresponding unit vectors {{{\bf{b}}_i}} with one in its ith position and zeros elsewhere. The r \times c matrix {\bf{H}}{}_{i,j} = {{\bf{a}}_i}\;{{\bf{b'}}_j} is used in the computation of the commutation matrix.

## Value

A list with r components

 1  A sublist of c components 2  A sublist of c components

...

 r  A sublist of c components

Each component j of sublist i is a matrix {\bf{H}}_{i,j}

## Note

The argument n must be an integer value greater than or equal to two.

## Author(s)

Frederick Novomestky fnovomes@poly.edu

## References

Magnus, J. R. and H. Neudecker (1979). The commutation matrix: some properties and applications, The Annals of Statistics, 7(2), 381-394.

Magnus, J. R. and H. Neudecker (1980). The elimination matrix, some lemmas and applications, SIAM Journal on Algebraic Discrete Methods, 1(4), December 1980, 422-449.

## Examples

 1 2 H.2.3 <- H.matrices( 2, 3 ) H.3 <- H.matrices( 3 ) 

matrixcalc documentation built on May 2, 2019, 1:45 p.m.