[R] bug when subtracting decimals?

[Dieter Menne]

Petr PIKAL <petr.pikal <at> precheza.cz> writes:

> Maybe that is because of Excel is so widespread now and gives expected 
> results (it probably silently rounds all decimal numbers before 
> calculation). 

Marc Schwartz already reminded me of that one, and it's a good point
to explicitly mention in lectures. 

I suggest to extend R by introducing %==% as "being Excellently equal".

Dieter