Alternative floating point support for GHC.

Category: Numerical

Hackage Homepage

## About altfloat

A replacement for the standard Haskell floating point types and supporting
functions. There are a number of shortcomings which I feel severely hinder
Haskell's utility for numerical computation. These shortcomings include
* There is no way to sanely convert between Haskell's floating types -- not
even between Double and CDouble. The implementation of the 'realToFrac'
function goes through 'Rational', which loses information as 'Rational'
cannot represent all floating point values.
* Making floating types an instance of 'Ord' makes no sense. 'Ord' is for
totally ordered data types, which floats are not. As a result, a number of
library functions (such as 'max' and 'sort') produce nonsensical results.
* The 'Enum' instance for floating types similarly makes little sense.
While 'fromEnum' and 'toEnum' functions use 'Int' instead of 'Integer',
limiting their usefulness, 'pred' and 'succ' can be defined in a much more
useful way.
* Functions that should care about negative zeros, such as 'signum' and
'abs', do not.
* Some functions, such as 'floor', have nonsensical behaviour for
non-finite input.
* The selection of floating point library functions pales in comparison to
C. This problem is made worse since, as noted above, it is impossible to
convert losslessly from 'Double' to 'CDouble' in order to use the FFI.
* There is no mechanism for handling rounding modes or exceptions.
This package is intended to address all of the above issues, and more.
Also provided, for convenience, is an alternative to the standard Prelude
which includes features from this library and the non-overlapping parts of
the standard Prelude.

## Author

Nick Bowler

## Maintainer

nbowler@draconx.ca

## License

OtherLicense

## Stability

experimental

## Dependencies

base, ghc-prim, integer-gmp, integer-simple, integer

## Modules

## Latest Version

0.3.1

## Older Versions

0.2, 0.2.1, 0.2.2, 0.3, 0.3.1