Plotting equations in 3D
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I have the equation:
x^2 + y^2 + z^2 = 1
How do I tell Matlab to plot this in the 3D plane? This is just one equation, but I will need to plot several in the 3D plane.
5 个评论
Adam
2017-7-5
I think you would need the Symbolic Toolbox to do this kind of thing. I only glanced at the equation initially and didn't register the '= 1' at the end of it which turns it into something that base Matlab doesn't cater for.
I've never worked with equation solving in Matlab myself so hopefully someone else can provide more information on usage of the Symbolic Toolbox or whatever other functionality is needed for this.
采纳的回答
Ari
2017-7-5
Your equation x^2 + y^2 + z^2 = 1 resembles a surface and can be plotted with the fsurf command in MATLAB which will need your function handle as an argument. You will need to rewrite the function as z expressed in terms of x and y as follows.
z = @(x,y) sqrt(x.^2 + y.^2 - 1); % function handle to anonymous function
fsurf(z)
For plotting multiple 3D surfaces on the same graph you can use the hold command as below. The hold command will plot subsequent plots in the same figure.
z1 = @(x,y) sqrt(x.^2 + y.^2 - 1);
z2 = @(x,y) sqrt(x.^2 + 2*y.^2 - 5);
fsurf(z1)
hold on
fsurf(z2)
3 个评论
Sakib Mahmud
2019-9-8
This equation will give half of a sphere. The rest half will come from -sqrt...
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HARSH MEHTA
2021-4-22
x^2 + y^3 + z^4 = f(x,y,z)
and X^2(y^3)(z^4) = f(x,y,z) how can i polt this both differently
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