3D plot Between one known and two unknown parameter.

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MADHVI 2023-5-25

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https://ww2.mathworks.cn/matlabcentral/answers/1973219-3d-plot-between-one-known-and-two-unknown-parameter

评论： MADHVI 2023-5-28

采纳的回答： Dyuman Joshi

For a given equation, A.^2+B.^2=R

I need to plot between A,B and R where R is known(R lies between 1 to 10 for 100 resolutions) and A and B is not known.

Thanks in advance.

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Nathan Hardenberg 2023-5-25

在 MATLAB Online 中打开

hmm... I'm still not sure what you want. If you do want to have three "inputs" A,B and R there is no function anymore. It can be either true or false.

Example:

A = 1; B = 1; R = 2;
A^2 + B^2 == R      % is true
ans = logical
   1
A = 1; B = 1; R = 1;
A^2 + B^2 == R      % is false
ans = logical
   0

You could only plot the "true"-datapoints. But this would result in the same plot as above, if I'm not mistaken

MADHVI 2023-5-28

Thank you.

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Dyuman Joshi 2023-5-25

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编辑：Dyuman Joshi 2023-5-27

在 MATLAB Online 中打开

"In 2D, it will definitely give a circle."

I assume you want to obtain all the circles corresponding to values in R in the same plot.

figure

hold on

%R lies between 1 to 10 for 100 resolutions

for R = linspace(1,10,100)

fimplicit(@(x, y) x.^2+y.^2-R)

end

grid on

hold off

Edit - You can also achieve this from the code mentioned in the comments by changing the view. But note that the resolution of R will not be same as you mentioned and as in the code above.

figure

fimplicit3(@(A,B,R) A.^2 + B.^2 - R)

axis equal

zlim([1,10]); xlim([-4,4]); ylim([-4,4])

view(2)