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

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.

Answer 1

[Walter Roberson]

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

[Gennaro Arguzzi]

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]

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]

Thank you so much @Walter Roberson and @Bruno Luong.