You are failing to take account of floating point arithmetic.
This is FAQ 7.31.
Really, it is advisable to check the FAQ before firing off a
naive inquiry to the r-help list.
cheers,
Rolf Turner
On 27/07/11 15:50, Heemun Kwok wrote:
Hello list,
I am having trouble with "match" and "which" giving a NA result for some
values, but not others. Here is a simple example:
aaa<- seq(0,1,by=0.05)
aaa
[1] 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70
[16] 0.75 0.80 0.85 0.90 0.95 1.00
match(0.5,aaa)
[1] 11
match(0.6,aaa)
[1] NA
which(aaa==0.5)
[1] 11
which(aaa==0.6)
integer(0)
sessionInfo()
R version 2.12.2 (2011-02-25)
Platform: i386-pc-mingw32/i386 (32-bit)
Am I missing something? Any thoughts?
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