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. 2011 Sep 19;27(21):3029–3035. doi: 10.1093/bioinformatics/btr522

Fig. 1.

Fig. 1.

Scatter plots of normalized sample PCs for the neural cell types data. Results from PCA, GPCA, Sparse Non-Negative PCA (SPCA) and Sparse Non-Negative GPCA (SGPCA) are compared for the five neural cell types. Sparse methods (bottom rows) demonstrate clearer separation of samples from different cell types.