Maintainer	Bas van Dijk <v.dijk.bas@gmail.com>
Safe Haskell	None

Data.Scientific

Contents

Conversions
Pretty printing

Description

This module is designed to be imported qualified:

import Data.Scientific as Scientific

Synopsis

Documentation

data Scientific Source

An arbitrary-precision number represented using scientific notation.

This type describes the set of all Reals which have a finite decimal expansion.

A scientific number with coefficient c and base10Exponent e corresponds to the Fractional number: fromInteger c * 10 ^^ e

Instances

Eq Scientific
Fractional Scientific	WARNING: `recip` and `/` will diverge when their outputs have an infinite decimal expansion. `fromRational` will diverge when the input `Rational` has an infinite decimal expansion.
Data Scientific
Num Scientific
Ord Scientific
Read Scientific
Real Scientific
RealFrac Scientific
Show Scientific
Typeable Scientific
NFData Scientific
Hashable Scientific

scientific :: Integer -> Int -> Scientific Source

scientific c e constructs a scientific number with coefficient c and base10Exponent e.

coefficient :: Scientific -> Integer Source

The coefficient of a scientific number.

base10Exponent :: Scientific -> Int Source

The base-10 exponent of a scientific number.

Conversions

fromFloatDigits :: RealFloat a => a -> Scientific Source

Efficient and exact conversion from a RealFloat into a Scientific number.

Pretty printing

data FPFormat Source

Control the rendering of floating point numbers.

Constructors

Exponent	Scientific notation (e.g. `2.3e123`).
Fixed	Standard decimal notation.
Generic	Use decimal notation for values between `0.1` and `9,999,999`, and scientific notation otherwise.

Instances

Enum FPFormat
Read FPFormat
Show FPFormat

scientificBuilder :: Scientific -> Builder Source

A Text Builder which renders a scientific number to full precision, using standard decimal notation for arguments whose absolute value lies between 0.1 and 9,999,999, and scientific notation otherwise.

formatScientificBuilder Source

Arguments

:: FPFormat
-> Maybe Int	Number of decimal places to render.
-> Scientific
-> Builder

Like scientificBuilder but provides rendering options.

formatScientific Source

Arguments

:: FPFormat
-> Maybe Int	Number of decimal places to render.
-> Scientific
-> String

Like show but provides rendering options.

toDecimalDigits :: Scientific -> ([Int], Int)Source

Similar to floatToDigits, toDecimalDigits takes a non-negative Scientific number, and returns a list of digits and a base-10 exponent. In particular, if x>=0, and

 toDecimalDigits x = ([d1,d2,...,dn], e)

then

```
n >= 1
```
```
x = 0.d1d2...dn * (10^^e)
```
```
0 <= di <= 9
```