Is there a method to set variable to NaN or Infinity?

< ^ > P N |<>|^_>< --- | ~ ...Help

Is there a built-in method to set a floating point value to NaN or
Infinity?  Or, is the only way to do this by

a = 0.0/0.0  #  set a to NaN

b = 3.0/0.0  #  set b to Infinity

c = -3.0/0.0  # set c to -Infinity

Also, how can I set value to -NaN?  This is possible in other languages,
but I can't do it in Ruby.  I've tried:

a = 0.0/0.0

b = -a

but b still comes out NaN.

--Alex
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