code: def initialize_from_matrix(cls, matrix, column):
          
          vec = Vector(matrix.get_height())
          for row in xrange(matrix.get_height()):
              vec.set_value(0, row, matrix.get_value(column, row))
          return vec
docs: Create vector from matrix
  
          :param Matrix matrix: The Matrix, which should be used to create the vector.
          :param integer column: The column of the matrix, which should be used
                                  to create the new vector.
          :raise: Raises an :py:exc:`IndexError` if the matrix does not have the specified column.