===== Primitive: Ellipsoid =====

**Definition**: <m>1-((x-x_0)/a)^2-((y-y_0)/b)^2-((z-z_0)/c)^2</m>

**Call**: hfEllipsoid(x,center,a,b,c);

**Parameters**:

x - point coordinates array

center - ellipsoid center array

a,b,c - ellipsoid half-axes along x,y,z

**Test file**: [[http://hyperfun.org/ellipsoid.hf|ellipsoid.hf]]
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