Changes gene identifiers by aggregating expression measures (sum). This is mainly useful when changing from Ensembl IDs to Gene Symbols
expression matrix (genes x cells)
character vector specifying the new identifer that corresponds
with each row of the input
This method is made fast by the use of sparse matrix multiplication
i.e.: (newIds x oldIds) x (oldIds x cells) = (newIds x cells)
a matrix in which rows with duplicate 'newIds' have been summed together
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