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Re: Plot3D?


Plot3D will only plot one surface over a rectangular region, it store only
matrix of heights.

Four solutions:

1) Plot separately,  DisplayFunction\[Rule]Identity turns of the display.

    g1 = Plot3D[x + y, {x, -5, 5}, {y, -5, 5},
        DisplayFunction -> Identity];
    g2 = Plot3D[x^2 + y^2, {x, -5, 5}, {y, -5, 5},
        DisplayFunction -> Identity];

Show them together, DisplayFunction\[Rule]$DisplayFunction turns the display
back on]

    Show[g1, g2, DisplayFunction -> $DisplayFunction]

2) Use Block to temporarity disable display:

    Show[Block[{$DisplayFunction = Identity},
       {Plot3D[x + y, {x, -5, 5}, {y, -5, 5}],
        Plot3D[x^2 + y^2, {x, -5, 5}, {y, -5, 5}]}]]

3) Load a standard package

    << "Graphics`Graphics`"

Now we can use

    DisplayTogether[Plot3D[x + y, {x, -5, 5}, {y, -5, 5}],
      Plot3D[x^2 + y^2, {x, -5, 5}, {y, -5, 5}]]

4) use ParametricPlot3D and adjust shape of bounding box.

    ParametricPlot3D[{{x, y, x + y}, {x, y, x^2 + y^2}},
      {x, -5, 5}, {y, -5, 5}, BoxRatios -> {1, 1, 0.4}]

--
Allan

---------------------
Allan Hayes
Mathematica Training and Consulting
Leicester UK
www.haystack.demon.co.uk
hay at haystack.demon.co.uk
Voice: +44 (0)116 271 4198
Fax: +44 (0)870 164 0565


"Rex_chaos" <rex_chaos at 21cn.com> wrote in message
news:aadbmd$qrd$1 at smc.vnet.net...
> Hello all,
> I want to plot 2 3D graph in a same figure. However, the following
> instruction report error:
>   Plot3D[List[x + y, x^2 + y^2], {x, -5, 5}, {y, -5, 5}]
>
> How can I do that?
>
> Thanks
>




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