Hello R-help,

I noticed the following surprising behavior when using %in% to find elements in a vector generated using seq().	

# weird!!!
> c(7.7, 7.8, 7.9) %in% seq(4, 8, by=0.1)
[1]  TRUE FALSE  TRUE

# OK now
> c(7.7, 7.8, 7.9) %in% round(seq(4, 8, by=0.1), 1)
[1] TRUE TRUE TRUE

# wait, how is this different?
> c(7.7, 7.8, 7.9) %in% seq(7, 8, by=0.1)
[1] TRUE TRUE TRUE

Is there an obvious reason for this behavior which I am missing? Seems like a bug to me...

Thanks in advance!
Vadim

> sessionInfo()
R version 2.12.0 (2010-10-15)
Platform: i386-apple-darwin9.8.0/i386 (32-bit)

locale:
[1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] graphics  grDevices utils     datasets  stats     methods   base     

other attached packages:
[1] cluster_1.13.1  nlme_3.1-97     lattice_0.19-13

loaded via a namespace (and not attached):
[1] grid_2.12.0




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