Calculate similarity transformations between configurations in two arrays.
Usage
transformations(Xrotated,Xoriginal)
Value
A list with components
translation
The translation parameters. These are the relative translations of the centroids of the individuals.
scale
The scale parameters
rotation
The rotation parameters. These are the rotations between the individuals after they have both been centred.
Arguments
Xrotated
Input k x m x n real array of the Procrustes
transformed configurations,
where k is the number of points, m
is the number of dimensions, and n is the sample size.
Xoriginal
Input k x m x n real array of the Procrustes
original configurations,
where k is the number of points, m
is the number of dimensions, and n is the sample size.
Author
Ian Dryden
References
Dryden, I.L. and Mardia, K.V. (2016). Statistical
Shape Analysis, with Applications in R (Second Edition). Wiley, Chichester.
#2D example : female and male Gorillas (cf. Dryden and Mardia, 2016)
data(gorf.dat)
Xorig <- gorf.dat
Xrotated <- procGPA(gorf.dat)$rotated
transformations(Xrotated,Xorig)