Пакет ghc8.6.4-scientific: Информация
Исходный пакет: ghc8.6.4-scientific
Версия: 0.3.6.2-alt1
Собран: 22 февраля 2022 г. 13:38
Категория: Разработка/Haskell
Сообщить об ошибке в пакетеДомашняя страница: https://github.com/basvandijk/scientific
Лицензия: BSD3
О пакете: Numbers represented using scientific notation
Описание:
"Data.Scientific" provides the number type 'Scientific'. Scientific numbers are arbitrary precision and space efficient. They are represented using <http://en.wikipedia.org/wiki/Scientific_notation scientific notation>. The implementation uses a coefficient @c :: 'Integer'@ and a base-10 exponent @e :: 'Int'@. A scientific number corresponds to the 'Fractional' number: @'fromInteger' c * 10 '^^' e@. Note that since we're using an 'Int' to represent the exponent these numbers aren't truly arbitrary precision. I intend to change the type of the exponent to 'Integer' in a future release. 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 @'Integral's@ (like: 'Int') or @'RealFloat's@ (like: 'Double' or 'Float') will always be bounded by the target type.
Сопровождающий: Evgeny Sinelnikov
Последнее изменение
24 апреля 2019 г. Evgeny Sinelnikov 0.3.6.2-alt1
- Spec created by cabal2rpm 0.20_11