http://calc3.askbot.com/questions/Open source question and answer forum written in Python and DjangoenCopyright Askbot, 2010-2011.Fri, 11 Jul 2014 15:29:17 -0500http://calc3.askbot.com/question/92/mathematica/So I'm trying to make a mathematica program that let's me manipulate the components and position of a directional vector and show the value of the directional derivative. Right now I'm still trying to get it to let me manipulate a directional vector on a plot. I tried to get the directional vector on the plot using Show[Plot3D[ x + y, {x, -10, 10}, {y, -10, 10}, ColorFunction -> "Rainbow", Mesh -> None], Manipulate[ Graphics3D[Arrow[{{u, v, u + v}, {a, b, c}}]], {u, -10, 10}, {v, -10, 10}, {a, -10, 10}, {b, -10, 10}, {c, -10, 10}], PlotRange -> All, AxesLabel -> {x, y, z}, ImageSize -> {400, 400}] Mathematica is fine with both of the graphics separately but when I use the Show command to put them in the same image I get an error message that says one of my options was not formatted as a rule and that skeleton is not a graphics3D primitive or derivative. Does anyone know what these messages are trying to tell me? **Update:Made it work. Everyone ignore this question.**SpaceManSpiffFri, 11 Jul 2014 15:29:17 -0500http://calc3.askbot.com/question/92/