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README
Data.List.ZigZag
The feature of this module is ZigZag and its class instances. It is an abstract data type and can be constructed / deconstructed by fromList / toList or fromDiagonals / toDiagonals. See the associated documentation for more information.
diagonals :: [[a]] > [[a]]
Finds the diagonals through a ragged list of lists.
For example, the diagonals of:
[ [0,1,2]
, []
, [3,4]
, [5,6,7]
]
Are:
[ [0]
, [1]
, [3,2]
, [5,4]
, [6]
, [7]
]
Which can be seen intuitively.
This algorithm works by storing a list of tails of rows already seen. To find the next diagonal we take the head of the next row plus the head of each stored tail. The tail remainders are stored plus the remainder of the new row.
If there are no more rows but some remaining tails we then iteratively form diagonals from the heads of each tail until there are no tails remaining.
Applied to the example:
Row  Output  Remaining 

[0,1,2] 
[0] 
[[1,2]] 
[] 
[1] 
[[2]] 
[3,4] 
[3,2] 
[[4]] 
[5,6,7] 
[5,4] 
[[6,7]] 
x  [6] 
[[7]] 
x  [7] 
[] 
fromDiagonals :: [[a]] > ZigZag a
Convert a list of diagonals to a ZigZag.
fromDiagonals . toDiagonals = id
toDiagonals . fromDiagonals = id
fromList :: [a] > ZigZag a
Convert a list to a ZigZag.
fromList . toList = id
toList . fromList = id
toDiagonals :: ZigZag a > [[a]]
Convert a ZigZag to a list of diagonals.
fromDiagonals . toDiagonals = id
toDiagonals . fromDiagonals = id
toList :: ZigZag a > [a]
Convert a ZigZag to a list.
fromList . toList = id
toList . fromList = id
ZigZag
A list but with a balanced enumeration of Cartesian product such that
fmap sum (sequence (replicate n (fromList [0..])))
is monotonically increasing.
Example:
sequence [fromList [0,1], fromList [0,1,2]]
= fromDiagonals
[ [[0,0]]
, [[1,0],[0,1]]
, [[1,1],[0,2]]
, [[1,2]]
]
This variation is useful in at least two ways. One, it is not stuck on infinite factors. Two, if the factors are ordered then the product is similarly ordered; this can lend to efficient searching of product elements.
Note that this method fails for the infinitary product even if every factor is known to be nonempty. The first element is known but following it are infinite elements that each draw a second element from one of the infinite factors. A product element drawing a third factor element is never reached.