scientific: Numbers represented using scientific notation

[ bsd3, data, library ] [ Propose Tags ]

Data.Scientific provides a space efficient and arbitrary precision scientific number type.

Scientific numbers are represented using scientific notation. It uses a coefficient c :: Integer and a base-10 exponent e :: Int (do note that since we're using an Int to represent the exponent these numbers aren't truly arbitrary precision). A scientific number corresponds to the Fractional number: fromInteger c * 10 ^^ e.

The main application of Scientific is to be used as the target of parsing arbitrary precision numbers coming from an untrusted source. The advantages over using Rational for this are that:

  • A Scientific is more efficient to construct. Rational numbers need to be constructed using % which has to compute the gcd of the numerator and denominator.

  • Scientific is safe against numbers with huge exponents. For example: 1e1000000000 :: Rational will fill up all space and crash your program. Scientific works as expected:

> read "1e1000000000" :: Scientific
1.0e1000000000
  • Also, the space usage of converting scientific numbers with huge exponents to Integrals (like: Int) or RealFloats (like: Double or Float) will always be bounded by the target type.

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Versions [RSS] 0.0.0.0, 0.0.0.1, 0.0.0.2, 0.1.0.0, 0.1.0.1, 0.2.0.0, 0.2.0.1, 0.2.0.2, 0.3.0.0, 0.3.0.1, 0.3.0.2, 0.3.1.0, 0.3.2.0, 0.3.2.1, 0.3.2.2, 0.3.3.0, 0.3.3.1, 0.3.3.2, 0.3.3.3, 0.3.3.4, 0.3.3.5, 0.3.3.6, 0.3.3.7, 0.3.3.8, 0.3.4.0, 0.3.4.1, 0.3.4.2, 0.3.4.3, 0.3.4.4, 0.3.4.5, 0.3.4.6, 0.3.4.7, 0.3.4.8, 0.3.4.9, 0.3.4.10, 0.3.4.11, 0.3.4.12, 0.3.4.13, 0.3.4.14, 0.3.4.15, 0.3.5.0, 0.3.5.1, 0.3.5.2, 0.3.5.3, 0.3.6.0, 0.3.6.1, 0.3.6.2, 0.3.7.0, 0.3.8.0
Dependencies array (>=0.1 && <0.6), base (>=4.4 && <4.8), bytestring (>=0.10 && <0.11), deepseq (>=1.3 && <1.4), ghc-prim, hashable (>=1.1.2 && <1.3), integer-gmp, text (>=0.8 && <1.3) [details]
License BSD-3-Clause
Author Bas van Dijk
Maintainer Bas van Dijk <v.dijk.bas@gmail.com>
Revised Revision 1 made by AdamBergmark at 2015-10-08T19:37:13Z
Category Data
Home page https://github.com/basvandijk/scientific
Bug tracker https://github.com/basvandijk/scientific/issues
Source repo head: git clone git://github.com/basvandijk/scientific.git
Uploaded by BasVanDijk at 2014-05-15T11:43:00Z
Distributions Arch:0.3.7.0, Debian:0.3.6.2, Fedora:0.3.7.0, FreeBSD:0.3.3.8, LTSHaskell:0.3.7.0, NixOS:0.3.7.0, Stackage:0.3.8.0, openSUSE:0.3.7.0
Reverse Dependencies 478 direct, 7298 indirect [details]
Downloads 404340 total (540 in the last 30 days)
Rating 2.25 (votes: 4) [estimated by Bayesian average]
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Status Docs available [build log]
Successful builds reported [all 1 reports]