src/Gargantext/Core/Text/Metrics/Utils.hs

   1 {-|
   2 Module      : Gargantext.Core.Text.Metrics.Utils
   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
  13 module Gargantext.Core.Text.Metrics.Utils where
  14
  15 import Gargantext.Prelude
  16 import Data.Map (empty, Map, insertWith, toList)
  17 import qualified Data.List as L
  18
  19 countElem :: (Ord k) => Data.Map.Map k Int -> k -> Data.Map.Map k Int
  20 countElem m e = Data.Map.insertWith (+) e 1 m
  21
  22 freq :: (Ord k) => [k] -> Data.Map.Map k Int
  23 freq = foldl countElem Data.Map.empty
  24
  25 getMaxFromMap :: Ord a => Map a1 a -> [a1]
  26 getMaxFromMap m = go [] Nothing (toList m)
  27   where
  28     go ks _        []           = ks
  29     go ks Nothing  ((k,v):rest) = go (k:ks) (Just v) rest
  30     go ks (Just u) ((k,v):rest)
  31         | v < u     = go ks     (Just u) rest
  32         | v > u     = go [k]    (Just v) rest
  33         | otherwise = go (k:ks) (Just v) rest
  34
  35
  36 average :: [Double] -> Double
  37 average x = L.sum x / L.genericLength x
  38
  39 average' :: [Int] -> Double
  40 average' x = (L.sum y) / (L.genericLength y) where
  41     y = L.map fromIntegral x
  42
  43