Nothing
require("Matrix")
AtoL <-
function(A){
p <- ncol(A)
whA <- which(A)
v1 <- whA%%p
v1[v1==0] <- p
v2 <- ceiling(whA/p)
ind <- v1 < v2
return(as.matrix(rbind(as.integer(v1), as.integer(v2))[,ind]))
}
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