Fixed axes during the iterations to plot 3D lines between two points

2018 11 10
1 个回答
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更新时间：2018 11 10
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Hello everyone,
I tried to write the code to plot a moving line in 3D by using the following code:
r = 3;
theta = linspace(0,2*pi,20);
lt = length(theta);
phi = pi/4;
for i = 1:lt
plot3([0 3*cos(phi)*cos(theta(i))], [0 3*cos(phi)*sin(theta(i))], [0 3*cos(phi)],'-b.','MarkerSize',20)
grid on
xlim = ([-3 3])
ylim = ([-3 3])
zlim = ([-0.5 3.5])
pause(0.3)
end
I would like to visualize a fixed reference frame (see xlim, ylim, zlim), for example: x axis also ways from left to the right, z axis always from bottom to top. My code gives me a reference frame whose axes change during the code execution.
I tried also by using the statement view (e.g. view(-37.500,30) which is the view after the last iteration), but the situation is the same.
EDIT: screenshot during the execution (I added hold on statement).
Thank you so much for your willingness.

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Walter Roberson
Walter Roberson 2018-11-10

1 个投票

xlim([-3 3])
ylim([-3 3])
zlim([-0.5 3.5])

3 个评论
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Gennaro Arguzzi
Gennaro Arguzzi 2018-11-10
编辑：Gennaro Arguzzi 2018-11-10
Hello @WalterRoberson, my code does not work and it contains the above three statements. It's quite strange. As you can see in the above figure, the negative part of the axes does not appear.
Bruno Luong
Bruno Luong 2018-11-10
编辑：Bruno Luong 2018-11-10
your code contain
xlim = ([-3 3]);
The equal sign is wrong, Walter deleted it. You have to do
>> clear all
Before rerun the fixed code
Gennaro Arguzzi
Gennaro Arguzzi 2018-11-10
Thank you so much @Walter Roberson and @Bruno Luong.

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