% -*- texinfo -*-
% @deftypefn {Function File} {} toeplitz (@var{c}, @var{r})
% Return the Toeplitz matrix constructed given the first column @var{c},
% and (optionally) the first row @var{r}. If the first element of @var{c}
% is not the same as the first element of @var{r}, the first element of
% @var{c} is used. If the second argument is omitted, the first row is
% taken to be the same as the first column.
%
% A square Toeplitz matrix has the form:
% @tex
% $$
% \left[\matrix{c_0 & r_1 & r_2 & \cdots & r_n\cr
% c_1 & c_0 & r_1 & \cdots & r_{n-1}\cr
% c_2 & c_1 & c_0 & \cdots & r_{n-2}\cr
% \vdots & \vdots & \vdots & \ddots & \vdots\cr
% c_n & c_{n-1} & c_{n-2} & \ldots & c_0}\right]
% $$
% @end tex
% @ifnottex
%
% @example
% @group
% c(0) r(1) r(2) @dots{} r(n)
% c(1) c(0) r(1) @dots{} r(n-1)
% c(2) c(1) c(0) @dots{} r(n-2)
% . , , . .
% . , , . .
% . , , . .
% c(n) c(n-1) c(n-2) @dots{} c(0)
% @end group
% @end example
% @end ifnottex
% @seealso{hankel, vander, sylvester_matrix, hilb, invhilb}
% @end deftypefn