The matrix being rotated contains the values of the component functional data objects computed in either a principal components analysis or a canonical correlation analysis. The values are computed over a fine mesh of argument values.
varmx(amat, normalize=FALSE)the matrix to be rotated. The number of rows is
equal to the number of argument values nx used
in a fine mesh. The number of columns is the number of
components to be rotated.
either TRUE or FALSE. If TRUE, the columns of
amat are normalized prior to computing the rotation
matrix. However, this is seldom needed for functional data.
a square rotation matrix of order equal to the number of components that are rotated. A rotation matrix $T$ has that property that $T'T = TT' = I$.
The VARIMAX criterion is the variance of the squared component values. As this criterion is maximized with respect to a rotation of the space spanned by the columns of the matrix, the squared loadings tend more and more to be either near 0 or near 1, and this tends to help with the process of labelling or interpreting the rotated matrix.