[R] Number of digits of a value for problem 7.31 RFAQ SOLVED not really
Richard.Cotton at hsl.gov.uk
Richard.Cotton at hsl.gov.uk
Mon Feb 18 18:32:46 CET 2008
> Actually (after some trials) there is a little problem when faced with
> zeros...
>
> >getndp(1.0)
> [1] 0
Are you sure this isn't what you want? 1.0 is just 1 in disguise, and
round(1.0, 0) is the same as round(1.0, 1) anyway.
> Note that I thought on a very different way which was starting from the
> point that as.character seems to work:
>
> a<-as.character(1.23134)
> b<-strsplit(a,"\\.")
>
> nchar(b)
I think the last line should be:
nchar(b[[1]][2])
If you choose this route, be careful with R clipping your values.
e.g.
x <- 0.12345678901234567890123456789
format(x, nsmall=20)
[1] "0.12345678901234567737" #this is what is stored (actually some binary
number, this is the closest decimal representation)
a <- as.character(x); a
[1] "0.123456789012346" #
b<-strsplit(a,"\\.")
nchar(b[[1]][2])
[1] 15
Regards,
Richie.
Mathematical Sciences Unit
HSL
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