Which function do I need to use to plot 3D

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Alex Rzhishev
Alex Rzhishev 2020-3-12
评论： Steven Lord 2020-3-12
I am trying to plot this 3D, and I cant come up with the necessary function.

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回答（2 个）

Alex Mcaulley
Alex Mcaulley 2020-3-12
Try surf
  1 个评论
Alex Rzhishev
Alex Rzhishev 2020-3-12
Thanks for the response, This is the code I have now, my only problem is the Z definition
xx = linspace(-10,10,20);
yy = linspace(10,-10,20);
[X,Y] = meshgrid(xx,yy);
Z = -X.^2 -Y.^2 + 200;
figure
surf(X,Y,Z)
xlabel('x'), ylabel('y'), zlabel('z')
view([-21 48])
What should I insert to the Z to have exact 3D like the image above?

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Sriram Tadavarty
Sriram Tadavarty 2020-3-12
Hi Alex,
Based on the image, the surf function can provide the desired output. The usage details of surf command can be found here https://www.mathworks.com/help/matlab/ref/surf.html
There are other 3d plot functions in MATLAB which can be used. The documentation links of those are
https://www.mathworks.com/help/matlab/ref/mesh.html
https://www.mathworks.com/help/matlab/ref/plot3.html
Hope this helps.
Regards,
Sriram
  1 个评论
Steven Lord
Steven Lord 2020-3-12
As a bit of a generalization of what Sriram said, if you know what you want the plot to look like but aren't sure if there's a function in MATLAB to create it, open the Plots tab on the Toolstrip. Expand the Plots section by pressing the downward facing triangle and look for a thumbnail that looks close to what you want. Underneath each thumbnail will be the name of the related function.
If you have the variable(s) you want to plot selected in the Workspace window, you can limit what gets shown to what is applicable to those variables or even just click on the thumbnail and have MATLAB plot the selected data using that function.

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