Tri2M: Lower/Upper Triangle Elements of a Matrix

In MCMCglmm: MCMC Generalised Linear Mixed Models

Lower/Upper Triangle Elements of a Matrix

Description

Lower/Upper triangle elements of a matrix or forms a matrix from a vector of lower/upper triangle elements

Usage

Tri2M(x, lower.tri = TRUE, reverse = TRUE, diag = TRUE)

Arguments

x	Matrix or vector
lower.tri	If x is a matrix then the lower triangle (TRUE) or upper triangle FALSE elements (including diagonal elements) are returned. If x is a vector a matrix is formed under the assumption that x are the lower triangle (TRUE) or upper triangle (FALSE) elements.
reverse	logical: ifTRUE a symmetric matrix is formed, if FALSE the remaining triangle is left as zeros.
diag	logical: ifTRUE diagonal elements are included.

Value

numeric or matrix

Author(s)

Jarrod Hadfield [e-mail]

Examples

M<-rIW(diag(3), 10)
x<-Tri2M(M)
x
Tri2M(x, reverse=TRUE)
Tri2M(x, reverse=FALSE)

MCMCglmm documentation built on July 9, 2023, 5:24 p.m.