Constract a tgScMat gene expression matrix object
scm_new_matrix(mat, cell_metadata, stat_type = "umi")
A matrix containing the expression data (will be stored as a sparse matrix)
dataframe with metadata on the cells. Rownames correspond to the cell names.
Type of statistic. ("umi", "rpkm", "tpm" etc.). Default: "umi"
A tgScMat gene expression matrix object