Nothing
upset.incidence <-
function(z, Q=NULL, ...) {
n <- ifelse(is.logical(Q), sum(Q), length(Q))
#as.vector(rowSums(z[,Q])>0) # problema con Q scalare
res <- colSums(matrix(z[Q,], nrow=n))>0
names(res) <- rownames(z)
return(res)
}
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