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[[File:Matrix_transpose.gif|256px|right|thumb|Matrix transposition]]
'''Transpose''' (a.k.a. '''flip''') swaps the leading two axes of a 2+ dimensional rectangular array. Dialects differ in their treatment of atoms, lists, and ragged arrays.▼
▲'''
+("ab";"cd";"ef")
("ace"
"bdf")
Atoms in otherwise rectangular arrays are extended to the full length of the corresponding dimension:
+(`a`b`c;`d)
(`a`d
Line 11 ⟶ 13:
`c`d)
==
Transposing a list in oK or ngn/k [[enlist]]s it. Transposing an atom enlists twice<ref>https://github.com/JohnEarnest/ok/issues/77</ref>:▼
▲Transposing a list in oK or ngn/k [[enlist]]s it. Transposing an atom enlists twice:
+,0
,,0
+0
,,0
K3, K4, and Kona<ref>https://github.com/kevinlawler/kona/issues/527</ref> return the argument as-is.
K9 throws a rank error.
==Ragged arrays==
oK and ngn/k reshape shorter rows to the length of the longest row:
+(`a`b`c;`d`e)
(`a`d
`b`e
`c`d)
K9 pads shorter rows with nulls:
+(`a`b`c;`d`e)
(`a`d
`b`e
`c`)
[[Category:Verbs]]
[[Category:Operator verbs]]
[[Category:Primitives]]
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Latest revision as of 07:59, 9 July 2022
Transpose
+x
![](https://upload.wikimedia.org/wikipedia/commons/e/e4/Matrix_transpose.gif)
transpose, a.k.a. flip, swaps the two leading axes of a 2+ dimensional rectangular array. Dialects differ in their treatment of atoms, lists, and ragged arrays.
+("ab";"cd";"ef") ("ace" "bdf")
Atoms in otherwise rectangular arrays are extended to the full length of the corresponding dimension:
+(`a`b`c;`d) (`a`d `b`d `c`d)
Atoms and lists[edit]
Transposing a list in oK or ngn/k enlists it. Transposing an atom enlists twice[1]:
+,0 ,,0 +0 ,,0
K3, K4, and Kona[2] return the argument as-is.
K9 throws a rank error.
Ragged arrays[edit]
oK and ngn/k reshape shorter rows to the length of the longest row:
+(`a`b`c;`d`e) (`a`d `b`e `c`d)
K9 pads shorter rows with nulls:
+(`a`b`c;`d`e) (`a`d `b`e `c`)