src/Gargantext/Text/Metrics/Freq.hs

   1 {-|
   2 Module      : Gargantext.Text.Metrics.Freq
   3 Description : Some functions to count.
   4 Copyright   : (c) CNRS, 2017-Present
   5 License     : AGPL + CECILL v3
   6 Maintainer  : team@gargantext.org
   7 Stability   : experimental
   8 Portability : POSIX
   9
  10 -}
  11
  12 {-# LANGUAGE NoImplicitPrelude #-}
  13
  14 module Gargantext.Text.Metrics.Freq where
  15
  16 import Gargantext.Prelude
  17 import Data.Bool (otherwise)
  18 import Data.Map (empty, Map, insertWith, toList)
  19 import qualified Data.List as L
  20
  21 countElem :: (Ord k) => Data.Map.Map k Int -> k -> Data.Map.Map k Int
  22 countElem m e = Data.Map.insertWith (+) e 1 m
  23
  24 freq :: (Ord k) => [k] -> Data.Map.Map k Int
  25 freq = foldl countElem Data.Map.empty
  26
  27 getMaxFromMap :: Ord a => Map a1 a -> [a1]
  28 getMaxFromMap m = go [] Nothing (toList m)
  29   where
  30     go ks _        []           = ks
  31     go ks Nothing  ((k,v):rest) = go (k:ks) (Just v) rest
  32     go ks (Just u) ((k,v):rest)
  33         | v < u     = go ks     (Just u) rest
  34         | v > u     = go [k]    (Just v) rest
  35         | otherwise = go (k:ks) (Just v) rest
  36
  37
  38 average :: [Double] -> Double
  39 average x = L.sum x / L.genericLength x
  40
  41 average' :: [Int] -> Double
  42 average' x = (L.sum y) / (L.genericLength y) where
  43     y = L.map fromIntegral x
  44
  45