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転置（transpose）

Python​

py
arr2 = map(list, zip(*arr1))
py
items = [
  [11, 12, 13],
  [21, 22, 23],
  [31, 32, 33],
  [41, 42, 43],
]
expected = [
  [11, 21, 31, 41],
  [12, 22, 32, 42],
  [13, 23, 33, 43],
]

actual = map(list, zip(*items))

print(expected == actual) # => True