# NOT RUN {
(ma1 <- matrix(sample(0:3,40,repl=TRUE),ncol=4,dimnames=list(NULL,letters[11:14])))
conv01toColNa(ma1)
conv01toColNa(ma1,colNa=LETTERS[1:4],ze=".")
conv01toColNa(ma1,colNa=LETTERS[1:4],pasteCol=TRUE)
# }
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