The qd package

[Tags:bsd3, library]

This package supports both a double-double datatype (approx. 32 decimal digits) and a quad-double datatype (approx. 64 decimal digits), using libqd (which is implemented in C++ with C and Fortran wrappers). To compile this package you need libqd to be installed.

Numeric.QD.DoubleDouble.DoubleDouble and Numeric.QD.QuadDouble.QuadDouble are strict tuples of CDoubles, with instances of: BinDecode, DecimalFormat, Eq, Floating, Fractional, Num, Ord, Read, Real, RealFrac, Show, Storable, Typeable.

Additional note: libqd depends on 64bit doubles, while some FPU architectures use 80bit. When using the Unsafe modules this might cause erroneous results; the Safe modules (used by the instances above) set and restore the FPU flags in foreign code to avoid race conditions from pre-emptive Haskell threading.

The RealFloat instances have been removed in this release as they were mostly broken: RealFloat semantics are for fixed-precision numbers.


Versions 0.1, 0.2, 0.4, 0.4.1, 1.0,
Dependencies base (==4.*), floatshow (==0.2.*) [details]
License BSD3
Author Claude Heiland-Allen
Category Math
Uploaded Fri Jun 10 09:20:55 UTC 2011 by ClaudeHeilandAllen
Distributions NixOS:
Downloads 1280 total (4 in the last 30 days)
0 []
Status Docs uploaded by user
Build status unknown [no reports yet]




Maintainer's Corner

For package maintainers and hackage trustees