How to find minimum of a 3D function in a double for loop plotted on a slice?

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Wiqas Ahmad 2022-4-20

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1700575-how-to-find-minimum-of-a-3d-function-in-a-double-for-loop-plotted-on-a-slice

评论： Wiqas Ahmad 2022-4-20

采纳的回答： Matt J

在 MATLAB Online 中打开

I have 24 subplots of a 3D function (costf) plotted on a slice using two forloops,h and fov, as:

The program is:

figure
count = 1;
for h = 1000:1000:4000
    for fov = [0.2, 0.5, 1, 2, 5, 10]       
        H = genHeight(h);
        a = 0.01:0.01:0.05;
        r = 4:20;
        [X, Y, Z] = meshgrid(r, a, H);
        xslice = r;
        yslice = a;
        zslice = H;
        subplot(6, 4, count) 
        slice(X, Y, Z,costf, xslice, yslice, zslice)
        shading interp   
        hCB=colorbar
        hCB.Label.String='Cost function';
        xlabel('CER_{ref}(\mum)')
        ylabel('\alpha_{ref}(1/m)')
        xlim([4, 20])
        zlabel('Height(m)')
        view([-221.831289102975 32.404205593246]);
        count = count + 1;
    end
end

I want to find the minimum value of the function "costf" in each loop, alternatively in each subplot and spot the minimum value in each subplot with asterisk. My cost function is a 3d function with dimensions, as:

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采纳的回答

Matt J 2022-4-20

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1700575-how-to-find-minimum-of-a-3d-function-in-a-double-for-loop-plotted-on-a-slice#answer_946570

编辑：Matt J 2022-4-20

在 MATLAB Online 中打开

figure
count = 1;
for h = 1000:1000:4000
    for fov = [0.2, 0.5, 1, 2, 5, 10]       
        ....
        
        tf=costf==min(costf(:));
        hold on
        scatter3(X(tf),Y(tf),Z(tf),'*')
        hold off
        
    end
end