3D Figures of Looping Variables

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Zaharaddeen Hussaini 2018-9-10

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https://ww2.mathworks.cn/matlabcentral/answers/418370-3d-figures-of-looping-variables

评论： ADragon 2018-9-10

采纳的回答： ADragon

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Hi,

I am tryig to make a 3D plot of some variables all in a loop. The best way I can describe it by citing an example.

For example:

clc;
clear;
close all;
count = 1;
for A = 1:5
    for B = 3:8
        for C = 2:7
            Sum= A+B+C;
            Product = A*B*C;
            val(1) = A;
            val(2) = B;
            val(3) = C;
            val(4) = Sum;
            val(5) = Product;
            Save (count,:) = val;
            count = count+1;
        end
    end
end

Now , I want to have three different figures for Variables A, B & C. Each figure has on the X axis a variable (Say C in the first case), Sum on the Y axis and Products on the Z- Axis with only C varying while A & B points are kept fixed.

2nd Figure would have B varying as A & C are fixed. The last would have A Varying with B & C fixed.

Any help/guide on how to this quickly and effectively please?

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Answer 1

ADragon 2018-9-10

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Hi Zaharaddeen, you can use a for loop to plot each variable.

Vars = {'A','B','C'};
for i = 1:3
    figure
    plot3(Save(:,i),Save(:,4),Save(:,5))
    xlabel(Vars{i})
    ylabel('Sum')
    zlabel('Product')
    grid on
end

AD

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Zaharaddeen Hussaini 2018-9-10

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So best way to do it is to make the plot after the loops are done. Kept trying to do it whilst inside the loop.

Thanks a lot. You made it look very easy.

ADragon 2018-9-10

No problem! Yes, I would recommend plotting after you construct your matrix. If you do it inside the loop, Matlab will create an object handle for each point which I don't think is very efficient. AD

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