> plus I imagine certain set operations would be problematic due to floating-point inaccuracies.

I doubt this, rounding errors happen only after arithmetic operations

as long as two floats are different, comparisons will show a strict order:

  DB<95> $one = 1-1e-16

  DB<96> printf '%.17f', $one
0.99999999999999989
  DB<97> p 1 > $one
1
  DB<98> $one = 1-1e-16

  DB<99> p $one
1
  DB<100>

[download]

FWIW 0.1e-1 and 1e-2 are the same float in my books.

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery

In reply to Re^5: Comparing a value to a list of numbers by LanX
in thread Comparing a value to a list of numbers by g_speran

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