This error can result from v with NAs.
e.g. to reproduce the error message
> v <- as.numeric(NA)
> if (is.numeric(v) && any(v < 0)) cat("hello world\n")
see also
https://stackoverflow.com/questions/7355187/error-in-if-while-condition-missing-value-where-true-false-needed
HTH,
Eric
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