For each feature/gene, this function returns the indices of the components they contribute to.
Usage
nbOccByGeneInComp(Slist, cutoff, sel)
Arguments
Slist
A list whose each element contains projection values of
features/genes on a component.
cutoff
A threshold to be used to define a gene as contributor
sel
A list whose each element contains projection values of
contributing features/genes on a component (the difference with arg
Slist is that sel is already restricted to the contributing genes).