Re: [Rd] round, unique and factor

From: Petr Savicky <savicky_at_cs.cas.cz>
Date: Mon, 21 Mar 2011 17:15:01 +0100

On Mon, Mar 21, 2011 at 10:46:41AM -0500, Terry Therneau wrote:
> Survfit had a bug in some prior releases due to the use of both
> unique(times) and table(times); I fixed it by rounding to 15 digits per
> the manual page for as.character. Yes, I should ferret out all the
> usages instead, but this was fast and it cured the user's problem.
> The bug is back! A data set from a local colleage triggers it.
> I can send the rda file to anyone who wishes.
>
> The current code has
> digits <- floor((.Machine$double.digits) *
> logb(.Machine$double.base,10)) #base 10 digits
> Y[,1] <- signif(Y[,1], digits)
>
> which gives 15 digits; should I subtract one more?
>
> Should the documentation change?
>
> In the meantime I'm looking at the more permanent fix of turning time
> into a factor, then back at the very end. Because it is a bigger change
> the potential for breakage is higer, however.

Can you describe the error in more detail? Is it related to consistency of converting a number to character and back?

Petr Savicky.



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