Plotting a line between two points

I am writing a script to simulate a mechanism. I am up to a point where I have x and y co-ordinates for each of the joints. I now need to plot lines between each point, for example between O2 and A. I attempted to put the x and y co-ordinates of each point into a matrix, but was having difficulties with that. Does anyone have any suggestions? Cheers.

    O2_x(i) = 0;
    O2_y(i) = 0;
    A_x(i) = (link_2*cos(theta_2(i)));
    A_y(i) = (link_2*sin(theta_2(i)));
    B_x(i) = (A_x(i) + (link_3*cos(theta_3(i))));
    B_y(i) = (A_y(i) + (link_3*sin(theta_3(i))));
    O4_x(i) = 3.79;
    O4_y(i) = 0;

Answer 1

[Mischa Kim]

Scott, did you try it this way?

 xi = [O2_x(i) A_x(i) B_x(i) O4_x(i)];
 yi = [O2_y(i) A_y(i) B_y(i) O4_y(i)];
 plot(xi, yi)

For two points you'd use

 xi = [O2_x(i) A_x(i)];
 yi = [O2_y(i) A_y(i)];

[Mischa Kim]

Check out:

 x = 0:0.1:pi;
 y = sin(x);
 t = 0:0.1:10;

 for ii = 1:numel(t)
    plot(x,y*sin(t(ii)))
    axis equal
    ylim([-1 1])
    F(ii) = getframe;
 end

Please add follow-up questions and comments as comments, not answers.

Answer 2

[Scott]

Hi Mischa, thanks so much.

I did try something similar, but I was putting an (i) out the front of the xi term. That makes complete sense now, thank you.

If you don't mind me asking, do you know how I would animate each iteration of the for loop?

Cheers, Scott