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| Module: | Array |
|---|---|
| Function: | ixmap |
| Type: | (Ix a, Ix b) => (a,a) -> (a -> b) -> Array b c -> Array a c |
| Description: | derive new arrays from existing ones, it allows for transformations on array indices |
| Related: |
Input: ixmap (2,4) (\i -> i) (array (1,5) [(1,1),(2,2),(3,3),(4,4),(5,5)])
Output: array (2,4) [(2,2),(3,3),(4,4)]
Input: ixmap (0,2) (\i -> i+2) (array (1,5) [(1,'A'),(2,'B'),(3,'C'),(4,'D'),(5,'E')])
Output: array (0,2) [(0,'B'),(1,'C'),(2,'D')]
Input: ixmap (1,2) (\i -> (i-1,i-1)) (array ((0,0),(1,1)) [((0,0),'A'),((1,0),'C'),((0,1),'D'),((1,1),'B')])
Output: array (1,2) [(1,'A'),(2,'B')]
Input: ixmap ((0,0),(1,1)) (\i -> (snd i, fst i)) (array ((0,0),(1,1)) [((0,0),'A'),((1,1),'B'),((1,0),'C'),((0,1),'D')])
Output: array ((0,0),(1,1)) [((0,0),'A'),((0,1),'C'),((1,0),'D'),((1,1),'B')]