Partitioned Enclose (⊂) is a dyadic function which splits its right argument into differently sized pieces as determined by the non-negative integer[note 1] left argument.
On a vector right argument, the corresponding element in the left argument indicates how many[note 1] divisions to begin there:
1 0 1 0 0 0 0⊂'HiEarth'
┌──┬─────┐
│Hi│Earth│
└──┴─────┘
Empty divisions can be inserted by beginning more than 1 division at a particular index[note 2]:
2 0 3 0 0 0 0⊂'HiEarth'
┌┬──┬┬┬─────┐
││Hi│││Earth│
└┴──┴┴┴─────┘
Additional trailing empty divisions are created by adding an additional division count corresponding to the index beyond the end of the right argument[note 2]:
1 0 1 0 0 0 0 1⊂'HiEarth'
┌──┬─────┬┐
│Hi│Earth││
└──┴─────┴┘
Partitioned Enclose allows a simple definition[note 3] of a split-into-lengths function:
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Split←{⍵ ⊂⍨ ⍸⍣¯1 +\ ¯1↓1,⍺}
3 3 4 Split 'HowAreYou?'
┌───┬───┬────┐
│How│Are│You?│
└───┴───┴────┘
Notes
- ↑ 1.0 1.1 Most dialects restrict this number to a maximum of 1.
- ↑ 2.0 2.1 Most dialects do not support this.
- ↑ In dialects that implement the full functionality of Partitioned Enclose.
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