Great responses, I managed to plot my parabola quite good (actually I graphed one with external software and used it as a texture just to compare and it was amazingly similar).
Thanks a lot guys.

Hello, I am new to SketchUp and to the SketchUP Community Forums aswell.

I wanted to model a surface defined by z=-x^2/10-y^2/10+10 which is a paraboloid facing down. I thought I could just draw a cut-through parabola, defined by y=-x^2/10+10 and then use the "follow me" tool with a circle to make a revolution.
But my problem is that I don´t know how can I graph it on a plane without having to plot several points and then joining them.

Thanks a lot.