`symm.info`

Compact information to construct the symmetrizer matrix

Description

This function provides the information required to create the symmetrizer matrix.

Usage

symm.info(n = 1)

Arguments

Argument	Description
`n`	order of the symmetrizer matrix.

Details

This function returns a list containing vectors that represent an element of the symmetrizer matrix and is accesed by the indexes in vectors row , col and values contained in val . This information is used by function symm.prod to do some operations involving the symmetrizer matrix without forming it. This information also can be obtained using function symmetrizer .

Value

A list containing the following elements:

Value	Description
`row`	vector of indexes, each entry represents the row index of the symmetrizer matrix.
`col`	vector of indexes, each entry represents the column index of the symmetrizer matrix.
`val`	vector of values, each entry represents the value of the symmetrizer matrix at element given by row and col indexes.
`order`	order of the symmetrizer matrix.

Examples

z <- symm.info(n = 3)
z # elements in symmetrizer matrix of order 3

N3 <- symmetrizer(n = 3, matrix = TRUE)
N3 # only recommended if n is very small

symm.info