[Rd] as.numeric - Possible error (PR#870)
Peter Dalgaard BSA
p.dalgaard@biostat.ku.dk
09 Mar 2001 10:46:15 +0100
maechler@stat.math.ethz.ch writes:
> >>>>> "harald" == harald fekjar <harald.fekjar@basalmed.uio.no> writes:
>
> harald> In R I get:
> harald> ---
> >> as.numeric(" ")
> harald> [1] 0
...
>
> Note that it's also for other ``blank like'' strings :
>
> > sapply(c("", " ", "\t", "\n", "\r"), as.numeric)
> \t \n \r
> 0 0 0 0 0
>
> Without having the time currently to investigate your suggested change,
> I tend to agree.
We fixed the same problem in scan() recently. Particularly insidious
since SPSS codes missing with a single blank when exporting delimited
files...
The problem there was that we used strtod which returns 0 for
nonnumerics (what else can it do?) and then checked the rest of the
field with isBlankString - which was true of course. I'll have a look
and see if as.numeric is similar.
--
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk) FAX: (+45) 35327907
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