Adds a new biplot layer for a specified pair of principal components.
The pair is sorted automatically (e.g. c(5, 3) becomes
c(3, 5)). Both PC indices must be between 1 and p
(the number of variables), and the pair must not already exist.
Usage
append_mdsDisplay(object, eigenvectors)
# S3 method for class 'bipl5_biplot'
append_mdsDisplay(object, eigenvectors)