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

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Gennaro Arguzzi
Gennaro Arguzzi 2018-11-10
编辑： Bruno Luong 2018-11-10
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
xlim([-3 3])
ylim([-3 3])
zlim([-0.5 3.5])
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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

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