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Hello, I have a question. I am trying to solve a optimization problem but my function has 3 variables and I am not sure how to plot a 3d diagram of 3 variable function.

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KSSV
KSSV 2021-5-3

1 个投票

Read about surf.

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Sanket Sutar
Sanket Sutar 2021-5-3
编辑：Sanket Sutar 2021-5-3
I forgot to mention the objective function is a nonlinear equation with three variables. Will surf function work? Thank you.
KSSV
KSSV 2021-5-3
What ever the function is...if you have matrix at the end, you can use surf.
Sanket Sutar
Sanket Sutar 2021-5-4
Hello KSSV, I read and tried using surf but can't seem to figure it out. I am very new to MATLAB.
And this is my function - (x+5).^2+(y+8).^2+(z+7).^2+(2.*x.^2.*y.^2)+(4.*x.^2.*z.^2);
Can you please point me in the right direction?
KSSV
KSSV 2021-5-4
m = 10 ;
x = linspace(0,1,m) ;
y = linspace(0,1,m) ;
z = linspace(0,1,m) ;
[x,y,z] = meshgrid(x,y,z) ;
f = (x+5).^2+(y+8).^2+(z+7).^2+(2.*x.^2.*y.^2)+(4.*x.^2.*z.^2);
figure
hold on
for i = 1:size(f,3)
surf(x(:,:,i),y(:,:,i),z(:,:,i),f(:,:,i)) ;
end
view(3)
Read about slice.
Sanket Sutar
Sanket Sutar 2021-5-5
Thank you so much for your help !!!

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