Drop: Difference between revisions
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Miraheze>Adám Brudzewsky No edit summary |
Miraheze>Adám Brudzewsky (class= → lang=) |
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Use Drop to remove leading or trailing [[elements]] from a [[vector]]: | Use Drop to remove leading or trailing [[elements]] from a [[vector]]: | ||
<source | <source lang=apl> | ||
3 ↓ 5 4 3 2 1 | 3 ↓ 5 4 3 2 1 | ||
2 1 | 2 1 | ||
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Removing more elements than the length of the axis gives an [[empty]] result: | Removing more elements than the length of the axis gives an [[empty]] result: | ||
<source | <source lang=apl> | ||
¯8 ↓ 5 4 3 2 1 | ¯8 ↓ 5 4 3 2 1 | ||
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When the right argument is a multidimensional array, one element from the left argument is used for each axis. In a language that supports [[axis specification]] for Take, or allows a short left argument, you can specify drop amounts for only some axes: other axes will remain unchanged. | When the right argument is a multidimensional array, one element from the left argument is used for each axis. In a language that supports [[axis specification]] for Take, or allows a short left argument, you can specify drop amounts for only some axes: other axes will remain unchanged. | ||
<source | <source lang=apl> | ||
2 3 ↓ ⍳4 5 | 2 3 ↓ ⍳4 5 | ||
┌───┬───┐ | ┌───┬───┐ | ||
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Drop can be modelled using Take with a complementary length: | Drop can be modelled using Take with a complementary length: | ||
<source | <source lang=apl> | ||
Drop ← { | Drop ← { | ||
s ← ⍴⍵ | s ← ⍴⍵ | ||