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# PCA with federated input matrices X1, X2, X3, X4
X = rbind($X1, $X2, $X3, $X4);

# Call built-in PCA function with K=2 components
[PC, V] = pca(X=X, K=$K, scale=TRUE, center=TRUE);

# Write results
write(PC, $PC);
write(V, $V);