with(plots):

cheers,

Willem

but you dont necessarily need to save the data to a file (see attached file)

worksheet_ymax.mw

Hi, Is this what you mean?

> restart; with(VectorCalculus);
> F := proc (x, y, z) options operator, arrow; 6*x^2+3*x*y^2-(3/2)*z^3 end proc;
> q := F(px, py, pz);
> H := Hessian(F(x, y, z), [x, y, z]);
> subs(x = px, y = py, z = pz, H);

I think you're missing some information