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swh:1:snp:a4c99a50dc49f82b591f268001b320f8c3ca0041
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Tip revision: 635622b024294f87a1442a50ad662642f5586aa7 authored by jmc on 14 July 2008, 00:00:00 UTC
version 1.0-4
Tip revision: 635622b
undefinedGets.R 
`undefined<-` <- function(x, codes = numeric(), value) {
      if(length(codes) > 0)
        x[ x %in% codes] <- NA
      x[is.na(x)] <- value
      x
  }
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