R: Split Matrix by Clusters and Return Lower Triangular Parts as...

lower.tri.vector {MESS}

R Documentation

Split Matrix by Clusters and Return Lower Triangular Parts as Vector

Split a matrix into block diagonal sub matrices according to clusters and combine the lower triangular parts into a vector

lower.tri.vector(x, cluster = rep(1, nrow(x)), diag = FALSE)

`x`	a square matrix
`cluster`	numeric or factor. Is used to identify the sub-matrices of `x` from which the lower triangular parts are extracted. Defaults to the full matrix.
`diag`	logical. Should the diagonal be included?

Returns a numeric vector containing the elements of the lower triangular sub matrices.


m <- matrix(1:64, ncol=8)
cluster <- c(1, 1, 1, 1, 2, 2, 3, 3)
lower.tri.vector(m, cluster)

[Package MESS version 0.5.7 Index]