geomorph (version 3.0.3)

arrayspecs: Convert landmark data matrix into array (p x k x n)

Description

Convert a matrix of landmark coordinates into a 3-dimensional array

Usage

arrayspecs(A, p, k)

Arguments

A

A matrix containing landmark coordinates for a set of specimens

p

Number of landmarks

k

Number of dimensions (2 or 3)

Value

Function returns a (p x k x n) array, where p is the number of landmark points, k is the number of landmark dimensions (2 or 3), and n is the number of specimens. The third dimension of this array contains names for each specimen if specified in the original input matrix.

Details

This function converts a matrix of landmark coordinates into a (p x k x n) array, which is the required input format for many functions in geomorph. The input matrix can be arranged such that the coordinates of each landmark are found on a separate row, or that each row contains all landmark coordinates for a single specimen.

Examples

x<-matrix(rnorm(18),nrow=3)  # Random triangles (all coordinates on same row for each triangle)
arrayspecs(x,3,2) 
 
x2<-matrix(rnorm(18),ncol=2) # Random triangles (each landmark on its own row)
arrayspecs(x2,3,2)