function [G]=gsp_airfoil()
%GSP_AIRFOIL Initialize the airfoil graph
% Usage: G=gsp_airfoil();
%
% Input parameters:
% none
% Output parameters:
% G : Graph structure.
%
% 'gsp_airfoil()' initializes a graph structure containing
% the weighted adjacency matrix (G.W), the number of vertices (G.N), the
% plotting coordinates (G.coords), and the plotting coordinate limits
% (G.limits) of the airfoil mesh graph. All edge weights are equal
% to 1.
%
% Example:
%
% G = gsp_airfoil();
% paramplot.show_edges = 1;
% gsp_plot_graph(G,paramplot);
%
% See also: gsp_graph
%
% Url: https://epfl-lts2.github.io/gspbox-html/doc/graphs/gsp_airfoil.html
% Copyright (C) 2013-2016 Nathanael Perraudin, Johan Paratte, David I Shuman.
% This file is part of GSPbox version 0.7.5
%
% This program is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program. If not, see <http://www.gnu.org/licenses/>.
% If you use this toolbox please kindly cite
% N. Perraudin, J. Paratte, D. Shuman, V. Kalofolias, P. Vandergheynst,
% and D. K. Hammond. GSPBOX: A toolbox for signal processing on graphs.
% ArXiv e-prints, Aug. 2014.
% http://arxiv.org/abs/1408.5781
% Author : David I Shuman, Nathanael Perraudin
% Date : 15 March 2014
load airfoil
%G.N=4253;
A = sparse(i_inds,j_inds,1,4253,4253);
G.W = (A + A')/2;
G.coords=[x,y];
G.plotting.limits=[-1e-4,1.01*max(x),-1e-4,1.01*max(y)];
G.type = 'airfoil';
G.plotting.vertex_size=30;
G = gsp_graph_default_parameters(G);
end