Started new branch for testing PCA
Started working on R script for sparse matrix
Finished R scripts, started writing output tests
Added input tests for PCA and Sparse PCA
Almost finished output tests except the compares function
Finished output test
Fix mistakes in R scripts, add R script for generating datasets, and generate answer files for output tests
Minor changes
Minor changes in R scripts
Minor changes again
Corrected data loading config.yaml
Corrected a bug in PCA/tables.yaml