You can set the rounding mode directly with ieee-utils.

Apparently it doesn't compile anymore, so someone has uploaded a temporary replacement: http://hackage.haskell.org/package/ieee-utils-tempfix-0.4.0.1

The primary maintainer of the original package left the haskell community some time ago. (I contributed some additional code many years ago). Michal Konecny -- would you be interested in taking over maintainership?

-s

On 4/7/14, 10:12 AM, Dominik Peteler wrote:

Hello list,

I'm going to implement an interval arithmetic library (following the IEEE P1788) in Haskell and for
that I need support for directed rounding to the nearest floating point
number. I had a quick look at the Decimal package which comes with the
`roundTo` function for rounding to a specified number of decimal places
but it doesn't provide directed rounding.
Is there way to get directed rounding to to the nearest float (maybe
even with machine floats) ?

I'm also aware of the AERN-* packages but they seem to be unmaintained. At
least there is no version which builds with the current GHC. Does
anybody know something about that ?

Regards

dominik

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