MCMCglmm (version 2.36)

Tri2M: 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)

Value

numeric or matrix

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.

Author

Jarrod Hadfield

Examples

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