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function nedge=savegts(v,f,fname,edges)
%
% nedge=savegts(v,f,fname,edges)
%
% save a surface mesh to GNU Triangulated Surface Format (GTS)
%
% author: Qianqian Fang, <q.fang at neu.edu>
% date: 2011/02/23
%
% input:
%      v: input, surface node list, dimension (nn,3)
%      f: input, surface face element list, dimension (be,3)
%      fname: output file name
%      edges: edge list, if ignored, savegts will compute
%
% output:
%      nedge: the number of unique edges in the mesh
%
% -- this function is part of iso2mesh toolbox (http://iso2mesh.sf.net)
%

fid=fopen(fname,'wt');
if(fid==-1)
    error('You do not have permission to save mesh files.');
end
v=v(:,1:3);
f=f(:,1:3);
[edges,idx,edgemap]=uniqedges(f);
nedge=size(edges,1);

fprintf(fid,'%d %d %d\n',size(v,1),nedge,size(f,1));
fprintf(fid,'%.16f %.16f %.16f\n',v');
fprintf(fid,'%d %d\n',edges');
fprintf(fid,'%d %d %d\n',edgemap');
fclose(fid);