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# numpy.ma.vstack

`numpy.ma.``vstack`(tup)

  > Stack arrays vertically.

  > vstack can be used to rebuild arrays divided by vsplit.

  Parameters: | tup : sequence of arrays Tuple containing arrays to be stacked. The arrays must have the same shape along all but the first axis.

  See also

  `array_split`
    Split an array into a list of multiple sub-arrays of near-equal size.
  `split`
    Split array into a list of multiple sub-arrays of equal size.
  `vsplit`
    Split array into a list of multiple sub-arrays vertically.
  `dsplit`
    Split array into a list of multiple sub-arrays along the 3rd axis (depth).
  `concatenate`
    Join arrays together.
  `hstack`
    Stack arrays in sequence horizontally (column wise).
  `dstack`
    Stack arrays in sequence depth wise (along third dimension).

  Notes

  The function is applied to both the _data and the _mask, if any.

  Examples

      >>> a = np.array([1, 2, 3])
      >>> b = np.array([2, 3, 4])
      >>> np.vstack((a,b))
      array([[1, 2, 3],
             [2, 3, 4]])
      >>> a = np.array([[1], [2], [3]])
      >>> b = np.array([[2], [3], [4]])
      >>> np.vstack((a,b))
      array([[1],
             [2],
             [3],
             [2],
             [3],
             [4]])

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