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Split: Difference between revisions
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(Created page with "{{Built-in|Split|↓}} is a monadic primitive function which reduces the rank of its argument by converting one of its axes to one level of nested a...") |
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== Alternatives == | |||
Most dialects do not have Split. Instead, the can use [[Enclose]] (<source lang=apl inline>⊂</source>) with [[bracket axis]] or the [[Rank operator]]: | |||
<source lang=apl> | |||
↓Y | |||
┌────┬────┬────┐ | |||
│ABCD│EFGH│IJKL│ | |||
├────┼────┼────┤ | |||
│MNOP│QRST│UVWX│ | |||
└────┴────┴────┘ | |||
⊂[3]Y | |||
┌────┬────┬────┐ | |||
│ABCD│EFGH│IJKL│ | |||
├────┼────┼────┤ | |||
│MNOP│QRST│UVWX│ | |||
└────┴────┴────┘ | |||
⊂⍤1⊢Y | |||
┌────┬────┬────┐ | |||
│ABCD│EFGH│IJKL│ | |||
├────┼────┼────┤ | |||
│MNOP│QRST│UVWX│ | |||
└────┴────┴────┘ | |||
</source> | |||
It is common to split a higher-[[rank]] array into its constituent [[major cell]]s. The behaviour of Split on matrices might mislead to the belief that this is what the primitive does. However, it isn't so vectors or arrays of higher rank than 2. Instead, the solution is to use or <source lang=apl inline>⊂[1↓⍳≢⍴Y]Y</source> or <source lang=apl inline>⊂⍤¯1⊢Y</source>: | |||
<source lang=apl> | |||
⊂[1↓⍳≢⍴Y]Y | |||
┌────┬────┐ | |||
│ABCD│MNOP│ | |||
│EFGH│QRST│ | |||
│IJKL│UVWX│ | |||
└────┴────┘ | |||
⊂⍤¯1⊢Y | |||
┌────┬────┐ | |||
│ABCD│MNOP│ | |||
│EFGH│QRST│ | |||
│IJKL│UVWX│ | |||
└────┴────┘ | |||
</source> | |||
== External links == | == External links == | ||