geomorph (version 4.0.8)

two.d.array: Convert (p x k x n) data array into 2D data matrix

Description

Convert a three-dimensional array of landmark coordinates into a two-dimensional matrix

Usage

two.d.array(A, sep = ".")

Value

Function returns a two-dimensional matrix of dimension (n x [p x k]), where rows represent specimens and columns represent variables.

Arguments

A

A 3D array (p x k x n) containing landmark coordinates for a set of specimens

sep

An optional argument for variable labeling, combining landmark labels (e.g., 1, 2, 3, ...) and partial dimension labels (e.g., "x", "y", and "z"), much like the paste function. The default is sep = ".", but this can be changed to any separator. One should make sure to match separators with arrayspecs if switching between matrices and arrays.

Author

Dean Adams and Emma Sherratt

Details

This function converts a (p x k x n) array of landmark coordinates into a two-dimensional matrix (n x [p x k]). The latter format of the shape data is useful for performing subsequent statistical analyses in R (e.g., PCA, MANOVA, PLS, etc.). Row labels are preserved if included in the original array.

See Also

arrayspecs

Examples

if (FALSE) {
data(plethodon) 
plethodon$land    #original data in the form of 3D array

two.d.array(plethodon$land)   # Convert to a 2D data matrix
}