coordinates: Get coordinates from compositions w.r.t. an specific basis

In coda.base: A Basic Set of Functions for Compositional Data Analysis

Get coordinates from compositions w.r.t. an specific basis

Description

Calculate the coordinates of a composition with respect a given basis

Usage

coordinates(X, basis = "ilr")

coord(..., basis = "ilr")

alr_c(X)

clr_c(X)

ilr_c(X)

olr_c(X)

Arguments

X	compositional dataset. Either a matrix, a data.frame or a vector
basis	basis used to calculate the coordinates. basis can be either a string or a matrix. Accepted values for strings are: 'ilr' (default), 'clr', 'alr', 'pw', 'pc', 'pb' and 'cdp'. If basis is a matrix, it is expected to have log-ratio basis given in columns.
...	components of the compositional data

Details

coordinates function calculates the coordinates of a compositiona w.r.t. a given basis. 'basis' parameter is used to set the basis, it can be either a matrix defining the log-contrasts in columns or a string defining some well-known log-contrast: 'alr' 'clr', 'ilr', 'pw', 'pc', 'pb' and 'cdp', for the additive log-ratio, centered log-ratio, isometric log-ratio, pairwise log-ratio, clr principal components, clr principal balances or default's CoDaPack balances respectively.

Value

Coordinates of composition X with respect the given basis.

See Also

See functions ilr_basis, alr_basis, clr_basis, sbp_basis to define different compositional basis. See function composition to obtain details on how to calculate a compositions from given coordinates.

Examples

# Default ilr given by ilr_basis(5) is given
coordinates(1:5)
B = ilr_basis(5)
coordinates(1:5, B)

coda.base documentation built on July 3, 2025, 1:09 a.m.