Nothing
## drop unanimous cols of a (rollcall) matrix
dropUnanimous <- function(obj, lop=0){
UseMethod("dropUnanimous")
}
dropUnanimous.rollcall <- function(obj,lop=0){
if(!inherits(obj, "rollcall"))
stop("dropUnanimous.rollcall only defined for objects of class rollcall")
dropRollCall(obj,
dropList=list(lop=lop))
}
dropUnanimous.matrix <- function(obj,lop=0){
if(!is.matrix(obj))
stop("dropUnanimous.matrix only defined for objects of class matrix")
if(lop>1 | lop<0 | is.na(lop) | !is.numeric(lop) | length(lop)!=1)
stop("bad value for lop, must be a single proportion")
goodObj <- !is.na(obj)
if(!all(as.vector(obj[goodObj]) %in% c(0,1,NA)))
stop("rollcall matrix contains codes other than 0, 1, and NA.")
m <- apply(obj,2,minMargin)
drop <- m <= lop
out <- obj[,!drop]
out
}
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