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### whiteningLoadings.R (2022-06-02)
###
### Compute (correlation) loadings Phi and Psi
###
### Copyright 2018-22 Korbinian Strimmer
###
###
### This file is part of the `whitening' library for R and related languages.
### It is made available under the terms of the GNU General Public
### License, version 3, or at your option, any later version,
### incorporated herein by reference.
###
### This program is distributed in the hope that it will be
### useful, but WITHOUT ANY WARRANTY; without even the implied
### warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
### PURPOSE. See the GNU General Public License for more
### details.
###
### You should have received a copy of the GNU General Public
### License along with this program; if not, write to the Free
### Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
### MA 02111-1307, USA
# compute whitening loadings (cross-covariance matrix Phi)
# and correlation loadings (cross-correlation matrix Psi)
# from a given covariance matrix Sigma
whiteningLoadings = function(Sigma,
method=c("ZCA", "ZCA-cor",
"PCA", "PCA-cor",
"Cholesky"))
{
method=match.arg(method)
PhiPsi = getPhiPsiW(Sigma, method, returnPhiPsi=TRUE)
return(PhiPsi)
}
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