3D plot a function f(x,y,z)

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Omar Keele
Omar Keele 2022-10-13
编辑： DGM 2023-4-20
I have a function of the coordinates x,y and z like the following :
function f= f(x,y,z)
if (x>0) & (y<1) % this is just an example, do whatever you want with the variables
f= 1;
else
f= x-y+2*z;
end
end
That I want to plot like by using the fimplicit3() function :
syms f(x,y,z)
f(x,y,z) = x^2 + y^2 - z^2;
fimplicit3(f)
The problem is fimplicit3 deals with the symbolic variables but fails to take as argument a function that I 'manually' specified above.
Is there another way to plot such a function ?
I just wanna draw some balls in space.

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回答（2 个）

David Hill
David Hill 2022-10-13
Ran in:
g=fimplicit3(@f);
function g = f(x,y,z)
g=1./x.^2 - 1./y.^2 + 1./z.^2;
end
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Omar Keele
Omar Keele 2022-10-13
I mentioned the fimplicit to illustrate, do you know a matlab command to do this ? Maybe scatter3D?
Something that plot values of f(x,y,z) with different colors, the space should be filled ! (or maybe empty if the value is 0)

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Drc
Drc 2023-4-20
guys i need this shape code
  1 个评论
DGM
DGM 2023-4-20
编辑：DGM 2023-4-20
Start a new question at the "Ask" link at the top of the page. Include enough information so that other people know specifically what you want. Considering that specific details were intentionally omitted from the image, I have to wonder why you're making it difficult.
Otherwise, see cylinder(), patch(), surf()

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