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That's probably because exp(r) is irrational for every rational r except for 0.

Not quite; what I'd be looking for, of course, would be an algorithm that would *approximate* exp. Basically, any numeric representation in a computer is going to be a sort of "rational", in that it uses a finite number of bytes, bits, digits, or whatever to represent any number.

The problem isn't that approximation algorithms don't exist; it's that I haven't been able to find one that converges rapidly. I know they're out there - I just haven't had the time to dig around and find them.

There is certainly something wrong with bigrat or its friends. I'm not sure who's maintaining the modules any more - it used to be Tels.

In reply to Re^8: Help me make a test case for Math::BigFloat by spiritway
in thread Help me make a test case for Math::BigFloat by fizbin

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