Plot 3D Graph and make level curves

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Bryan Ambrósio
Bryan Ambrósio 2021-4-22
评论： Star Strider 2021-5-1
Hi
I have 3 vectors, where:
X is a vector of numbers;
Y is a vector of numbers;
Z is a function that depends on X and Y (i.e)
Z = 4.6597*x.^2 + 2.6897*x.*y - 0.023578*x + 8.1189*y.^2 - 1.9553*y - 1.2304;
I want to plot a 3D curve and I am not succeding. Can someone help me please? Thanks

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采纳的回答

Star Strider
Star Strider 2021-4-23
编辑：Star Strider 2021-4-23
Use the plot3 function.
If you then want it as a 2D plot, use the view function to rotate it.
EDIT — (23 Apr 2021 at 03:17)
I was intending that to use any of the q3D plotting functions, the vectors need to be transformed into matrices first, and then transformed back into vector to use plot3:
X = ...;
Y = ...;
[Xm,Ym] = ndgrid(X,Y);
Zfcn = @(x,y) 4.6597*x.^2 + 2.6897*x.*y - 0.023578*x + 8.1189*y.^2 - 1.9553*y - 1.2304;
Zm = Zfcn(Xm,Ym);
figure
plot3(Xm(:), Ym(:), Zm(:))
grid on
.
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更多回答（2 个）

Bryan Ambrósio
Bryan Ambrósio 2021-4-23
I have tried plot3, but it doesnt fill my needs entirely
Bryan Ambrósio
Bryan Ambrósio 2021-4-23
in plot3 z cannot be a function

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