weixin_39781930 2020-11-30 12:58
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Problems with all 3 forms of Each Pair

in k2.8


  (,':) . (1 2;3 4 5)
(1 2
 4 3
 5 4)

  {x,':y} . (1 2;3 4 5)
(1 2
 4 3
 5 4)

  1 2 ,': 3 4 5
(1 2
 4 3
 5 4)

in kona


  (,':) . (1 2;3 4 5)
,3 4 5 1 2

  {x,':y} . (1 2;3 4 5)
(1 2 3
 4 3
 5 4)

  1 2 ,': 3 4 5
(1 2 3
 4 3
 5 4)

该提问来源于开源项目：kevinlawler/kona

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  • weixin_39781930 2020-11-30 12:58
    关注

    In the k2.0 reference manual

    
Each Pair applies its argument function f  to successive pairs of consecutive items in the list argument y. 
If y is a list of count at least two, then f':x  is a list withcount (#x)-1  
and the ith item of the result is  f[x[i+1];x[i]]. 
For example:
  -': 1 4 9 14 25 36
3 5 5 11 11

    This works in kona:

    
    -': 1 4 9 14 25 36
3 5 5 11 11
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