#written by David Stanley
reverseKey=function(itemNames,itemNames2ReverseKey) {
lengthItems=length(itemNames)
lengthItemsUnique=length(unique(itemNames))
if (lengthItems!=lengthItemsUnique) {
print("Item names are not unique: reverseKey will not work")
return(NA)
}
keyValues=rep(1,lengthItems)
matchKey=!is.na(match(itemNames,itemNames2ReverseKey))
keyValues[matchKey]=-1
return(keyValues)
}
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