formatn: Formatting of doubles.
This package provides support for number formatting styles, especially styles involving significant figure calculations.
Usage
>>>import Data.FormatN>>>comma (Just 3) 12341,230
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Downloads
- formatn-0.3.2.0.tar.gz [browse] (Cabal source package)
- Package description (as included in the package)
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For package maintainers and hackage trustees
Candidates
| Versions [RSS] | 0.0.1, 0.1.0, 0.2.0, 0.2.1, 0.2.2, 0.3.0, 0.3.0.1, 0.3.1.0, 0.3.1.1, 0.3.2.0 |
|---|---|
| Change log | ChangeLog.md |
| Dependencies | base (>=4.14 && <5), containers (>=0.6 && <0.9), text (>=1.2 && <2.2) [details] |
| Tested with | ghc ==9.6.7, ghc ==9.8.4, ghc ==9.10.2, ghc ==9.12.2 |
| License | BSD-3-Clause |
| Copyright | Tony Day (c) 2016 |
| Author | Tony Day |
| Maintainer | tonyday567@gmail.com |
| Category | text |
| Home page | https://github.com/tonyday567/formatn#readme |
| Bug tracker | https://github.com/tonyday567/formatn/issues |
| Source repo | head: git clone https://github.com/tonyday567/formatn |
| Uploaded | by tonyday567 at 2025-07-27T01:11:09Z |
| Distributions | LTSHaskell:0.3.2.0, NixOS:0.3.1.0, Stackage:0.3.2.0 |
| Reverse Dependencies | 3 direct, 5 indirect [details] |
| Downloads | 1290 total (42 in the last 30 days) |
| Rating | (no votes yet) [estimated by Bayesian average] |
| Your Rating | |
| Status | Docs available [build log] Last success reported on 2025-07-27 [all 1 reports] |
Readme for formatn-0.3.2.0
[back to package description]
A library for support of:
- significant figure rounding of numbers, and
- common number formatting patterns.
Usage
:reload
:set prompt "> "
:set -Wno-type-defaults
:set -XOverloadedStrings
import Data.FormatN
xs = [(-1),0,0.1,1,1.01,1.02,1.1,1.2]
fixed (Just 2) <$> xs
decimal (Just 2) <$> xs
formats False False (const DecimalStyle) (Just 2) xs
formats False True (const DecimalStyle) (Just 2) xs
distinguish 4 False True (const DecimalStyle) (Just 2) xs
Ok, 14 modules loaded.
> >
>
> ["-1.00","0.00","0.10","1.00","1.01","1.02","1.10","1.20"]
["-1.0","0.0","0.10","1.0","1.0","1.0","1.1","1.2"]
["-1.00","0.00","0.10","1.00","1.00","1.00","1.10","1.20"]
["-1.0","0.0","0.1","1.0","1.0","1.0","1.1","1.2"]
["-1.00","0.00","0.10","1.00","1.01","1.02","1.10","1.20"]
Development
fixed
fixed (Just 3) <$> [0, 0.5, 1.5, 2.0]
["0.000","0.500","1.500","2.000"]
fixed defaults to representing Doubles in the same manner as Haskell does ie with a trailing ’.0’
fixed Nothing <$> [0, 0.5, 1.5, 2]
["0.0","0.5","1.5","2.0"]
expt
expt Nothing 0
0e0
expt (Just 2) 1
expt (Just 2) 0
1.0e0
0.0e0
decimal
decimal Nothing 0
decimal (Just 1) 0
decimal (Just 3) 0
0
0
0.00
percent
percent is a little weird any way you cut it.
percent decimalSF (Just 4) 0
percent decimalSF (Just 4) 1
0.0%
100.0%
inclusion in lists
formats True False commaPrecStyle Nothing [0, 0.5, 1.5, 2]
formats True False commaPrecStyle (Just 1) [0, 1, 10]
formats True False commaPrecStyle (Just 1) [0, 0.5, 1.5, 2]
formats True False commaPrecStyle (Just 2) [0, 0.5, 1.5, 2]
formats True True commaPrecStyle (Just 6) [0, 0.5, 1.5, 2]
["0.0","0.5","1.5","2.0"]
[" 0"," 1","10"]
["0.0","0.5","2.0","2.0"]
["0.00","0.50","1.50","2.00"]
["0.0","0.5","1.5","2.0"]