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scipy.sparse.coo_matrix.

# tocsc

coo_matrix.tocsc(copy=False)

  Convert this array/matrix to Compressed Sparse Column format

  Duplicate entries will be summed together.

  Examples

      >>> from numpy import array
      >>> from scipy.sparse import coo_array
      >>> row  = array([0, 0, 1, 3, 1, 0, 0])
      >>> col  = array([0, 2, 1, 3, 1, 0, 0])
      >>> data = array([1, 1, 1, 1, 1, 1, 1])
      >>> A = coo_array((data, (row, col)), shape=(4, 4)).tocsc()
      >>> A.toarray()
      array([[3, 0, 1, 0],
             [0, 2, 0, 0],
             [0, 0, 0, 0],
             [0, 0, 0, 1]])