[Bro] logarithm or exponential function for .bro?

[Jaeyeon Jung]

Hi,

What is the best way to compute log (x) or exp (x) (and get
the double-precision result) in a Bro policy? I notice 
that large-conns.bro has logarithm() implemented, but 
this returns the integer logarithm.

Thanks!
Jaeyeon
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