The footprint is defined as the size-normalized geometric mena of the number of umis per metacells, dvided by the median over all metacells.
mc_compute_fp(mc, us, norm_by_mc_size = T, min_total_umi = 10)a metacell object
umi matrix
normalize by mean total umis and then multiply by median mean mc size (or at least 1000). This means umis per 1000 molecules.
consider genes with at least min_total_umi total umis