Plot 3D Graph and make level curves
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Bryan Ambrósio
am 22 Apr. 2021
Kommentiert: Star Strider
am 1 Mai 2021
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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Star Strider
am 23 Apr. 2021
Bearbeitet: Star Strider
am 23 Apr. 2021
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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