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# scipy.sparse.vstack

`scipy.sparse.``vstack`(blocks, format=None, dtype=None)

  Stack sparse matrices vertically (row wise)

  Parameters : | blocks : sequence of sparse matrices with compatible shapes format : string sparse format of the result (e.g. “csr”) by default an appropriate sparse matrix format is returned. This choice is subject to change.

  See also

  `hstack`
    stack sparse matrices horizontally (column wise)

  Examples

      >>> from scipy.sparse import coo_matrix, vstack
      >>> A = coo_matrix([[1,2],[3,4]])
      >>> B = coo_matrix([[5,6]])
      >>> vstack( [A,B] ).todense()
      matrix([[1, 2],
              [3, 4],
              [5, 6]])

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