deka: Decimal floating point arithmetic
deka provides decimal floating point arithmetic. It is based on the decNumber C library, which is available at
http://speleotrove.com/decimal/decnumber.html
decNumber, in turn, implements the General Decimal Arithmetic Specification, which is available at
http://speleotrove.com/decimal/
For more on deka, please see the Github home page at
https://github.com/massysett/deka
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| Versions [RSS] | 0.2.0.0, 0.2.0.2, 0.4.0.0, 0.4.0.2, 0.4.0.4, 0.6.0.0, 0.6.0.2 |
|---|---|
| Change log | ChangeLog |
| Dependencies | base (>=4.5.0.0 && <4.8), bytestring (>=0.9.2.1 && <0.11) [details] |
| License | BSD-3-Clause |
| Copyright | 2014 Omari Norman |
| Author | Omari Norman |
| Maintainer | omari@smileystation.com |
| Category | Math |
| Home page | http://www.github.com/massysett/deka |
| Uploaded | by OmariNorman at 2014-04-17T19:57:13Z |
| Distributions | |
| Reverse Dependencies | 2 direct, 0 indirect [details] |
| Downloads | 5486 total (17 in the last 30 days) |
| Rating | (no votes yet) [estimated by Bayesian average] |
| Your Rating | |
| Status | Docs available [build log] Successful builds reported [all 1 reports] |
Readme for deka-0.4.0.4
[back to package description]deka
deka provides correctly rounded decimal arithmetic for Haskell.
The core of deka is a binding to the C library decNumber. As the author of deka, I have no association with the author of decNumber, and any errors in this library are mine and should be reported to omari@smileystation.com or to the Github tracker at
http://www.github.com/massysett/deka
deka uses the decQuad functions in decNumber. This means that deka is limited to 34 digits of precision. Because 1 quadrillion (that is, one thousand trillion) has only 16 digits of precision, I figure that 34 should be sufficient for many uses. Also, you are limited to exponents no smaller than -6176 and no greater than 6111. deka will notify you if you perform calculations that must be rounded in order to fit within the 34 digits of precision or within the size limits for the exponent.
You will want to understand decNumber and the General Decimal Arithmetic Specification in order to fully understand deka. The specification is at
http://speleotrove.com/decimal/decarith.html
and decNumber is at
http://speleotrove.com/decimal/decnumber.html
and more about decimal arithmetic generally at
http://speleotrove.com/decimal/
Dependencies
The main deka library depends only on base and bytestring, so it
shouldn't be difficult to build. The
tests use tasty and
QuickCheck. The
decNumber C library is bundled in; GHC will build it and link it for
you when you install deka.
More documentation
Much more documentation is available in the Haddock comments in the source files. There is also a file of examples to get you started. It has copious comments. It is written in literate Haskell, so the compiler keeps me honest with the example code. Unfortunately Haddock does not play very nice with literate Haskell. However, the file is easy to view on Github:
License
deka is licensed under the BSD license, see the LICENSE file.
Build status
