Vectors of different length when using plot3.

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Snirisa Gödel
Snirisa Gödel 2013-9-25
评论： Snirisa Gödel 2013-9-26
Basically I want to do a 3D plot of 100 circles with different radii and on a new height plane(h) for each circle. The radius increase for each circle(constant increase) and h increase constantly.
I've never used plot3 before so this code is from the top of my head. I was thinking of using a for loop for both r and h as suggested below. But where should I begin the loop for h? In the beginning(just under r) or as below? And what does it mean that "vectors must be of same length". Which vector?
if true
% for r=1:1:100
t=linspace(0,2*pi);
x=r*cos(t);
y=r*sin(t);
for h=100:100:10000
z=h;
plot3(x,y,z)
end
end

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采纳的回答

Image Analyst
Image Analyst 2013-9-26
You might want to rethink your parameters because it sort of looks like a mess with way too many circles on the screen, but anyway, run this:
for r=1:1:100
t=linspace(0,2*pi);
x=r*cos(t);
y=r*sin(t);
for h=100:100:10000
z=h * ones(1, length(t));
plot3(x,y,z);
if r == 1 && h == 100
hold on;
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
end
drawnow;
end
end
  1 个评论
Snirisa Gödel
Snirisa Gödel 2013-9-26
Thank you, this looks much closer to what I had in mind. As you mentioned, this looks like a mess but I'm sure it's just a matter of changing parameters in this case. I appreciate it.

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更多回答（2 个）

dpb
dpb 2013-9-25
Why not try it and see if it's the effect desired?
From
doc plot3
...
plot3(x,y,z), where x, y and z are three vectors of the same length, ...
Roger Stafford
Roger Stafford 2013-9-26
Change the line
plot3(x,y,z)
to
plot3(x,y,repmat(z,1,size(t,2)))
hold on

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