| Safe Haskell | Safe |
|---|---|
| Language | Haskell98 |
Data.Distribution.Aggregator
Description
Module containing functions to apply on lists of values tagged with their probability, in order to somehow aggregate or transform the probabilities.
- data Aggregator a
- makeAggregator :: ([(a, Probability)] -> [Probability]) -> Aggregator a
- makePureAggregator :: ([Probability] -> [Probability]) -> Aggregator a
- separated :: Ord a => a -> Aggregator a -> Aggregator a -> Aggregator a
- modifyProbabilities :: Aggregator a -> [(a, Probability)] -> [Probability]
- aggregateWith :: Aggregator a -> [(a, Probability)] -> [(a, Probability)]
- cumulative :: Aggregator a
- decreasing :: Aggregator a
- complementary :: Aggregator a
Aggregation
data Aggregator a Source #
Functions that can modify probabilities.
Creation
makeAggregator :: ([(a, Probability)] -> [Probability]) -> Aggregator a Source #
Creates an aggregator from a function. The function should not modify the number of elements.
makePureAggregator :: ([Probability] -> [Probability]) -> Aggregator a Source #
Creates an aggregator from a function ignoring the values. The function should not modify the number of elements.
separated :: Ord a => a -> Aggregator a -> Aggregator a -> Aggregator a Source #
Aggregator that applies the first aggregator on values less than x
and the second on values greater than x. Potential probability at x
is left untouched.
Application
modifyProbabilities :: Aggregator a -> [(a, Probability)] -> [Probability] Source #
Applies the aggregator and returns the modified list of probabilities.
aggregateWith :: Aggregator a -> [(a, Probability)] -> [(a, Probability)] Source #
Applies an aggregator on a list of values tagged with their probability. The values themselves are left unchanged.
Useful aggregators
cumulative :: Aggregator a Source #
Adds to each probability the sum of the probabilities earlier in the list.
>>>aggregateWith cumulative $ toList $ uniform [1 .. 5][(1,1 % 5),(2,2 % 5),(3,3 % 5),(4,4 % 5),(5,1 % 1)]
decreasing :: Aggregator a Source #
Adds to each probability the sum of probabilities later in the list.
>>>aggregateWith decreasing $ toList $ uniform [1 .. 5][(1,1 % 1),(2,4 % 5),(3,3 % 5),(4,2 % 5),(5,1 % 5)]
complementary :: Aggregator a Source #
Replaces each probability by its complement.
>>>aggregateWith complementary $ toList $ uniform [1 .. 5][(1,4 % 5),(2,4 % 5),(3,4 % 5),(4,4 % 5),(5,4 % 5)]