[R] R not 'seeing' numbers?!

[oscar]

Hello.

I recently came across the extremely strange problem (see below) of R
telling me that elements of a list do not exist...

I have tried running this small script on 2 computers (Mac OSX 10.7 &
Windows 7) running the latest releases or R (2.13.2 on Mac, 2.14.0 on Win). 
I have tried it both in the standard R console, and in RStudio (v.
0.94.110), and all have the same problem.

Any ideas?!  I'm stumped...

Thanks,

Oscar.

Code (with comments):


tmp=seq(20,90,0.005)

# I want to find the position of 35.52:
which(tmp==35.52)
# integer(0)  -- It's not there?!

tmp[3100:3110] # check to see if it's there...
# [1] 35.495 35.500 35.505 35.510 35.515 35.520 35.525 35.530 35.535 35.540
35.545  -- it is.
which(tmp==35.525)
# [1] 3106
which(tmp==35.515)
# [1] 3104
tmp[3105]
# [1] 35.52

# Interestingly:
for (i in seq(30.52,50.52,1)) print(paste(i,which(tmp==i))) # works fine...
# ... I'm stuck.



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