I=rationalSurface(P2,d,L,Pn)
I=rationalSurface(P2,d,L,x)
I=rationalSurface(points,d,L,x)
The function chooses randomly s point p_i in P2 and computes the linear system H=L(d;L) of form of degree d which have multiplicity r_i at the point p_i.
Then the ideal of the image of P2 of under the rational map defined by the linear system H is computed.
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The object rationalSurface is a method function.