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| w4m_filter_by_sample_class | Filter W4M data matrix by sample-class |
| w4m_filter_imputation | Impute values for W4M data matrix |
| w4m__nonzero_var | Support function to eliminate rows or columns that have zero variance |
| w4m__var_by_rank_or_file | Support function to compute variances of matrix rows or columns |