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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);
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