transpose

Array[Array[X]] transpose(Array[Array[X]])

Transposes a two-dimensional array according to the standard matrix transposition rules, i.e. each row of the input array becomes a column of the output array. The input array must be square - i.e., every row must have the same number of elements - or an error is raised. If either the inner or the outer array is empty, an empty array is returned.

Parameters

1. Array[Array[X]]: A M*N two-dimensional array.

Returns: A N*M two-dimensional array (Array[Array[X]]) containing the transposed input array.

Example: test_transpose.wdl

version 1.2

workflow test_transpose {
  # input array is 2 rows * 3 columns
  Array[Array[Int]] input_array = [[0, 1, 2], [3, 4, 5]]
  # output array is 3 rows * 2 columns
  Array[Array[Int]] expected_output_array = [[0, 3], [1, 4], [2, 5]]
  
  output {
    Array[Array[Int]] out = transpose(input_array) 
    Array[Array[Int]] expected = expected_output_array
    Boolean is_true = out == expected
  }
}

{}

{
  "test_transpose.out": [[0, 3], [1, 4], [2, 5]],
  "test_transpose.expected": [[0, 3], [1, 4], [2, 5]],
  "test_transpose.is_true": true
}