Popularity
6.8
Declining
Activity
0.0
Stable
18
5
1
Monthly Downloads: 20
Programming language: Haskell
License: MIT License
Latest version: v1.0.3.0
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README
This module implements dynamic time warping as described on Wikipedia
Additionally 'fastDtw' is implemented as described in the paper: "FastDTW: Toward Accurate Dynamic Time Warping in Linear Time and Space" by Stan Salvador and Philip Chan.
For further information see the documentation of the Data.DTW
module.
Example
>>>  create two sample datasets
>>> let as = [ sin x  x < [0,0.1..pi] ]
>>> let bs = [ sin (x+0.1)  x < [0,0.1..pi] ]
>>>  define a cost function between two datapoints
>>> let dist x y = abs (xy)
>>>  define a function that will half the size of a dataset (see below)
>>> let shrink xs = case xs of (a:b:cs) > (a+b)/2 : shrink cs; a:[] > [a]; [] > []
>>>  calculate the cost with fastDtw and dtwMemo for comparison
>>> cost $ fastDtw dist shrink 2 as bs :: Float
>>> 0.19879311
>>> cost $ dtwMemo (\x y > abs (xy)) as bs :: Float
>>> 0.19879311