vech2tri: Vector to Triangular Matrix
In jeksterslabds/jeksterslabRds: Jekster's Lab Data Science and Statistics

Description Usage Arguments Author(s) Examples

Fills a matrix with a vector that represents the triangular elements. The function can produce a strictly triangular matrix, that is, the diagonal elements are set to zero or a triangular matrix with diagonal values supplied by the argument x. Note that the matrix is filled by column.

1	vech2tri(x, lower = TRUE, diag = FALSE)

`x`	A vector.
`lower`	Logical. If `TRUE`, creates a lower triangular matrix. If `FALSE`, creates an upper triangular matrix.
`diag`	Logical. If `TRUE`, values of the diagonal as supplied by `x`. If `FALSE`, diagonals are set to zero and `x` fills only the off-diagonal elements of the matrix producing a strictly triangular matrix.

Ivan Jacob Agaloos Pesigan

# Stricly lower triangular matrix
vech2tri(1:10, lower = TRUE, diag = FALSE)
# Lower triangular matrix with diagonal and off-diagonal values
# supplied by the argument x
vech2tri(1:10, lower = TRUE, diag = TRUE)
# Stricly upper triangular matrix
vech2tri(1:10, lower = FALSE, diag = FALSE)
# Upper triangular matrix with diagonal and off-diagonal values
# supplied by the argument x
vech2tri(1:10, lower = FALSE, diag = TRUE)