numpy.diagonal(a, offset=0, axis1=0, axis2=1)

numpy.ravel_multi_index(multi_index, dims, mode='raise', order='C') Converts a tuple of index arrays into an array

numpy.diag(v, k=0)

nditer.copy() Get a copy of the iterator in its current state. Examples

numpy.triu_indices_from(arr, k=0)

numpy.take(a, indices, axis=None, out=None, mode='raise')

class numpy.nditer

numpy.ix_(*args)

flatiter.copy() Get a copy of the iterator as a 1-D array. Examples

numpy.select(condlist, choicelist, default=0)