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can we plot this in 3d
i tried surf but i couldnt draw it.
i solved this question. i found at google isosurface function. its for 3d plot.
for axises i used daspect([1 1 1]) and it worked fbetter i think ^^ thank you all for help.
syms X Y Z V
[X,Y,Z] = meshgrid(linspace(-3,3,25));
V = (X.^2+9*Y.^2/4+Z.^2-1).^3 - X.^2.*Z.^3
fv = isosurface(V,0)
fvc = isosurface(V,'red')
p = patch(isosurface(X,Y,Z,V,-0))
daspect([1 1 1])
and the result is good. to see results: [img=http://s15.postimage.org/nb4pyscrv/kalp.jpg]