stefan.d...@gmail.com:

> I came across a strange behavior of expand.grid (or at least strange to
> me).
> 
> For certain values of one of my input variables - created by seq() - I
> have to use strings (e.g ==".6") to select a row of the object
> created by expand.grid(), for other values numerical (e.g. ==.8) and
> for some both work.

It’s not a bug. Please see 
http://wiki.r-project.org/rwiki/doku.php?id=misc:r_accuracy&s=floating
and the documents referenced therein.

-- 
Karl Ove Hufthammer

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