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enter image description here

That is what l want,but l can only use Show,Plot3D to get something just like this

enter image description here

What should l do?Thanks~

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    $\begingroup$ First of all you should post a Mathematica code for those who might wish to help you without wasting their time $\endgroup$ Feb 5, 2015 at 9:56

1 Answer 1

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Try this:

 Show[{
  Plot3D[x^2, {x, -2, 2}, {y, -2, 2}],
  ParametricPlot3D[{x, 0, x^2 + 0.15}, {x, -2, 1.9}, 
    PlotStyle -> Arrowheads[0.07]] /. Line -> Arrow

    }]

yielding

enter image description here

Have fun!

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