This function filteres a GeneSetCollection by removing all contained
GeneSets that do not include at least the user-specified number of
genes also found in the user-specified universe.
Optional character vector of gene identfiers to be considered as the
universe. Only geneIds included in the universe will count toward the
gene set membership counts. If 'NULL' (default), all featureNames of the
CMAPCollection will be considered.
min.members
Number of genes (in the univerese) a gene set needs to contain to be retained.
Value
A CMAPCollection with all gene sets containing more than the specified
number of members.