Construct a Toeplitz matrix.
The Toeplitz matrix has constant diagonals, with c as its first column and r as its first row. If r is not given, r == conjugate(c) is assumed.
Parameters :  c : array_like
r : array_like


Returns :  A : array, shape (len(c), len(r))

Notes
The behavior when c or r is a scalar, or when c is complex and r is None, was changed in version 0.8.0. The behavior in previous versions was undocumented and is no longer supported.
Examples
>>> from scipy.linalg import toeplitz
>>> toeplitz([1,2,3], [1,4,5,6])
array([[1, 4, 5, 6],
[2, 1, 4, 5],
[3, 2, 1, 4]])
>>> toeplitz([1.0, 2+3j, 41j])
array([[ 1.+0.j, 2.3.j, 4.+1.j],
[ 2.+3.j, 1.+0.j, 2.3.j],
[ 4.1.j, 2.+3.j, 1.+0.j]])