numpy.tril(m, k=0)

numpy.full(shape, fill_value, dtype=None, order='C')

numpy.identity(n, dtype=None)

numpy.zeros_like(a, dtype=None, order='K', subok=True)

numpy.tri(N, M=None, k=0, dtype=)

numpy.bmat(obj, ldict=None, gdict=None)

numpy.core.records.fromstring(datastring, dtype=None, shape=None, offset=0, formats=None, names=None, titles=None, aligned=False,

numpy.ones_like(a, dtype=None, order='K', subok=True)

numpy.fromfunction(function, shape, **kwargs)

numpy.empty(shape, dtype=float, order='C') Return a new array of given shape and type, without initializing entries.