hello,
today while trying to extract data from a list for subsequent analysis, i
stumbled upon this funny behavior on my system:
> x<-c(0.1,0.9)
> 1-x[2]
[1] 0.1
> x[1]
[1] 0.1
> x[1]==1-x[2]
[1] FALSE
> x[1]>1-x[2]
[1] TRUE
> x<-c(0.3,0.7)
> x[1]
[1] 0.3
> x[2]
[1] 0.7
> 1-x[2]
[1] 0.3
> x[1]==1-x[2]
[1] FALSE
but:
> x<-c(0.4,0.6)
> x[1]
[1] 0.4
> x[2]
[1] 0.6
> 1-x[2]
[1] 0.4
> x[1]==1-x[2]
[1] TRUE
any ideas why this might be? in my data i have values that are calculated
like above, e.g.
y=x if x<=0.5, else y=1-x
now because of that behaviour whenever i want to get values e.g. <0.1 from
my data, i will also get all values of y=0.1 that came from the subtraction.
i'm using R 2.4.0 on windows XP; this is my sessionInfo():
> sessionInfo()
R version 2.4.0 (2006-10-03)
i386-pc-mingw32
locale:
LC_COLLATE=Spanish_Spain.1252;LC_CTYPE=Spanish_Spain.1252;LC_MONETARY=Spanis
h_Spain.1252;LC_NUMERIC=C;LC_TIME=Spanish_Spain.1252
attached base packages:
[1] "methods" "stats" "graphics" "grDevices" "utils" "datasets"
"base"
>
thanks a lot
martin
[[alternative HTML version deleted]]
______________________________________________
[email protected] mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
