U Math Library?
Fragment of a discussion from Talk:ScalarN/Version History
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It's written by me, and not yet open sourced ;)
And it's very simple. Just have a look at Neuromancer.FastMath. U just wrapped similar things in an elegant API ;)
just found a good math library Commons Math3
it has a much better approximation of exp than the look-up-table without memory version, and is still 2x faster than StrictMath