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 Author Comment/Response Renaud 10/31/12 1:20pm I'm trying to plot the resulting conic, calculated by a dot product. Manipulate[ K = {Sin[t] Cos[p], Sin[t] Sin[p], Cos[t]}; oP = {x, y, 1}; noP = Assuming[Element[{t, x, y, z}, Reals], Simplify[Norm[oP]]]; nK = Assuming[Element[{t, p, x, y, z}, Reals], Simplify[Norm[K]]]; {(K.oP)^2 == (Cos[a]*nK*noP)^2, {x, -30, 30}, {y, -30, 30}}, {a, Pi/16, Pi, Pi/16, ControlPlacement -> Left}, {t, 0, \[Pi], \[Pi]/256, ControlPlacement -> Left}, {p, 0, \[Pi], \[Pi]/256, ControlPlacement -> Left}] It does return a good conic equation, but whenever I try to graphic with ParametricPlot[{equation}, {x, -10, 10}, {y, -10, 10}], it only plot the axes. However, =={equation} does plot it right. Should I change my equation or switch ParametricPlot for something else? URL: ,

 Subject (listing for 'Plotting conics') Author Date Posted Plotting conics Renaud 10/31/12 1:20pm Re: Plotting conics Michael 11/07/12 4:24pm
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