Re: [Haskell-cafe] [ANN] deka - decimal arithmetic

* Omari Norman [2014-02-08 15:46:49-0500]

On Sat, Feb 8, 2014 at 3:39 PM, Nicolas Trangez wrote:

...

Note there's some existing support for this in `base`:

On Sat, 2014-02-08 at 15:06 -0500, Omari Norman wrote:

...

but for a short explanation, go into ghci and type:

print $ 0.1 + 0.1 + 0.1

λ print $ (0.1 + 0.1 + 0.1 :: Double) 0.30000000000000004

λ :m + Data.Fixed

Key word there is "Fixed"; deka supports floating point with up to 34 digits of precision but

So it is fixed, too? I'm not sure "Fixed" qualifies as a key word, then :) Note that Data.Fixed doesn't put any restrictions on the (fixed) precision. You could easily define E34. So yeah, a comparison with Data.Fixed would be nice to see. Is deka faster? By how much? Does it support any additional operations? Which ones? Roman