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2D random paths generator integrating leg's contraints

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from 2D random paths generator integrating leg's contraints by Sebastien PARIS
Generates random 2D leg'paths from departure to arrival integrating leg's constraints

circulant.m 
function t = circulant(c)

% Return the circulant matrix according vector c
% 
% Usage    W = circulant([c]);
% -----
% Input
% -----
% c           vector (1 x D )(default [1 1 0 0 0 0 0 1 ])
%
% Output
% ------
%
% W           matrice (D x D)
%
% Example
% -------
%
% delta_d = circulant([1 1 0 0 0 0 0 1 ]);
%
%
%
% Author          Sbastien PARIS (sebastien.paris@lsis.org)
% -------

if (nargin < 1)
    
    c  = [1 1 0 0 0 0 0 1 ];
    
end

m    = length(c);

c    = c(:);

Om   = ones(m , 1);

ridx = (1:m);

cidx = ridx';

t    = cidx(: , Om) - ridx(Om , :);

t    = t - floor(t./m).*m +  1;

t(:) = c(t);

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