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iS <- cut(x, breaks=cutpoints, include.lowest=TRUE, labels= FALSE)
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if(any(ii <- is.na(iS))) {
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##-- can get 0, if x[i]== minc --- only case ?
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## else if(!is.logical(x))
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## stop("'x' must be numeric or logical")
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else { ## assume logical x : no need for cut(points)
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stop("must have 2 'symbols' for logical 'x' argument")
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iS <- x + 1 # F = 1, T = 2