vechs: Strict Half-Vectorize

In jeksterslab/strRegression: Structure of Regression

Description

Apply a strict half-vectorization, that is, half-vectorize an m \times m symmetric matrix without the diagonal elements.

Usage

vechs(x, names = FALSE, sep = ".")

Arguments

x	Matrix.
names	Logical. Add names.
sep	Character string. Separator for variable names.

Details

Generates an (m(m + 1) / 2) - m vector from the unique elements of an m \times m symmetric matrix, excluding the diagonals, by stacking the columns (column-major).

Value

A vector.

Dependencies

• vechsnames()

Author(s)

Ivan Jacob Agaloos Pesigan

References

Wikipedia: Half-vectorization

See Also

Other Linear Algebra Functions: dcap(), sym_of_vechs(), sym_of_vech(), vechnames(), vechsnames(), vech()

Examples

x <- matrix(
  data = c(
    1.0, 0.5, 0.4,
    0.5, 1.0, 0.6,
    0.4, 0.6, 1.0
  ),
  ncol = 3
)

vechs(x)

jeksterslab/strRegression documentation built on Dec. 20, 2021, 10:12 p.m.