Matlab F(x,y,z) Plotting

Question

Ömer Faruk Çetinkaya 2020-5-16

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https://ww2.mathworks.cn/matlabcentral/answers/525950-matlab-f-x-y-z-plotting

移动：Torsten 2023-4-20

Greetings,

I would like to plot a function i.e. f(x,y,z) = X.^4 - 2*X.^2 + Y.^2 + 2*Y*Z +2*Z.^2 for my backtracking optimization problem. I am able to plot the contour of f(x,y) questions with the code given below. But I couldn't even plot a contour such function. Any help would be appreciated.

xAxis = linspace(-1,2.5,1000);
yAxis = linspace(-1,2.5,1000);
zAxis = linspace(-1,2.5,1000);
[ X,Y ] = meshgrid(xAxis,yAxis);
Z = X.^2 + 5*Y.^2 ;
contour(X,Y,Z,30)

Best Regards,

Ömer

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Answer 1

Ameer Hamza 2020-5-16

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编辑：Ameer Hamza 2020-5-16

在 MATLAB Online 中打开

You can use slice() to create a contour plot of your function at specified planes. Try this

xAxis = linspace(-1,2.5,100);
yAxis = linspace(-1,2.5,100);
zAxis = linspace(-1,2.5,100);
[X, Y, Z] = meshgrid(xAxis,yAxis,zAxis);
f = X.^4 - 2*X.^2 + Y.^2 + 2*Y.*Z +2*Z.^2;
x_planes = [1 2];
y_places = 0;
z_planes = [0.5 1];
slice(X, Y, Z, f, x_planes, y_places, z_planes);