% -*- texinfo -*-
% @deftypefn {Function File} {} vander (@var{c}, @var{n})
% Return the Vandermonde matrix whose next to last column is @var{c}.
% If @var{n} is specified, it determines the number of columns;
% otherwise, @var{n} is taken to be equal to the length of @var{c}.
%
% A Vandermonde matrix has the form:
% @tex
% $$
% \left[\matrix{c_1^{n-1} & \cdots & c_1^2 & c_1 & 1 \cr
% c_2^{n-1} & \cdots & c_2^2 & c_2 & 1 \cr
% \vdots & \ddots & \vdots & \vdots & \vdots \cr
% c_n^{n-1} & \cdots & c_n^2 & c_n & 1 }\right]
% $$
% @end tex
% @ifnottex
%
% @example
% @group
% c(1)^(n-1) @dots{} c(1)^2 c(1) 1
% c(2)^(n-1) @dots{} c(2)^2 c(2) 1
% . . . . .
% . . . . .
% . . . . .
% c(n)^(n-1) @dots{} c(n)^2 c(n) 1
% @end group
% @end example
% @end ifnottex
% @seealso{hankel, sylvester_matrix, hilb, invhilb, toeplitz}
% @end deftypefn