Just for completeness, in the dev snapshot version concat() is
not needed for this case anymore.
It's enough to simply write:
verts = [
for(i=[0:nverts-1]) [ scalex*i/nverts, f(i/nverts) ],
for(i=[nverts-1:-1:0]) [ scalex*i/nverts, -f(i/nverts) ]
];
ciao,
Torsten.
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-- Torsten