# Tri2M

0th

Percentile

##### Lower/Upper Triangle Elements of a Matrix

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

Keywords
manip
##### 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

• Tri2M
##### Examples
# NOT RUN {
M<-rIW(diag(3), 10)
x<-Tri2M(M)
x
Tri2M(x, reverse=TRUE)
Tri2M(x, reverse=FALSE)
# }

Documentation reproduced from package MCMCglmm, version 2.29, License: GPL (>= 2)

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