def numpy_array_from_list_or_numpy_array(vectors):
<EOL>if not isinstance(vectors, numpy.ndarray):<EOL><INDENT>V = numpy.zeros((vectors[<NUM_LIT:0>].shape[<NUM_LIT:0>], len(vectors)))<EOL>for index in range(len(vectors)):<EOL><INDENT>vector = vectors[index]<EOL>V[:, index] = vector<EOL><DEDENT>return V<EOL><DEDENT>return vectors<EOL>
Returns numpy array representation of argument.

Argument maybe numpy array (input is returned)
or a list of numpy vectors.