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Compute PCA in R with built-in prcomp function
# With built-in prcomp function:
# Compute PCA
pc <- prcomp(D, center = T, scale. = T)
# Eigenvalues
# Eigenvectors (loadings)
pc$rotation[, 1:20]
# New features (principal components, also called scores)
pc$x[, 1:20]
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