Here is an example. Read more: 2-D Geometry Creation at Command Line
t = 0:0.2:2*pi; % make sure the curve is unclosed (decsg throws an error)
r = 5 + sin(5*t);
[x,y] = pol2cart(t,r);
dl = [2; length(x); x(:); y(:)]; % [polygon; # of points; x; y]
gd = decsg(dl); % decomposition
[p,e,t] = initmesh(gd,'Hmax',0.5); % max side triangle 0.5
pdemesh(p,e,t);
hold on
plot(x,y,'.g')
