Some quick 'n dirty matlab functions for working with graphs and their important matrices.

easygplot.m

function easygplot( A )
%EASYGPLOT What gplot should do by default.
%   EASYGPLOT puts all nodes on a circle equidistantly starting at (1, 0)
%   and going counter clockwise. 2-way edges are plotted in black, edges
%   from node i to node j with i < j are plotted in blue, and edges from
%   node j to i with j > i are plotted in red.
%
%   It's assumed that A(i,j) = 1 if there is an edge from j into i, and
%   A(i,j) is zero otherwise.

%   Parts where stolen from http://www.mathworks.nl/matlabcentral/fileexchange/16131-plot-a-directed-graph

n = size(A, 1);
t = linspace(0, 2*pi, n + 1);

coords = [cos(t(1:n))' sin(t(1:n))'];

dA  = A .* (1 - A');  % Directed edges (1-way)
dAl = tril(dA, -1);   % Directed edges (1-way, i -> j with i < j)
dAu = triu(dA, 1);    % directed edges (1-way, j -> i with j > i)
uA  = A - dA;         % Undirected edges (2-way, i -> j and j -> i)

figure();   % Open a new figure every time.
gplot(uA, coords, '-k');

hold on;

gplot(dAl, coords, '-b');
gplot(dAu, coords, '-r');

hold off;

end

mat2tex.m

function mat2tex( matrix, varargin )
%MAT2TEX Print a matrix in TeX format.
%   MAT2TEX allows you to print a matrix to (La)TeX. It outputs the
%   matrix as a \begin{env}...\end{env} block, where env defaults to
%   pmatrix. Each element of the matrix is printed in a supplied fmt
%   which is '%d' by default.

if nargin > 2
    env = varargin{1};
    fmt = varargin{2};
elseif nargin == 2
    env = varargin{1};
    fmt = '%d';
else
    env = 'pmatrix';
    fmt = '%d';
end

fprintf('\n\\begin{%s}\n', env);

[n,m] = size(matrix);

for i = 1:n
    fprintf('  ');
    for j = 1:m
        fprintf(fmt, matrix(i,j));
        if j < m
            fprintf(' %s ', '&');
        end
    end
    if i < n
      fprintf(' %s', '\\');
    end
    fprintf('\n');
end
    
fprintf('\\end{%s}\n\n', env);
end