Plotting a line moving down straight vertically. Both the lines are not rotating in symmetry.

L1=60;
L2=15;
t=60;
for t1=t:-1:0
    plot([-L1*cosd(t),0],[L1*sind(t1),0]);
    hold on
    grid on
    plot([0,L2*cosd(t1)],[0,-L2*sind(t1)]);    
    axis([-70 70 -70 70]);
    hold off
    pause(0.1);
end

Answer 1

[KALYAN ACHARJYA]

"Both the lines are not rotating in symmetry."

plot([-L1*cosd(t1),0],[L1*sind(t1),0]); % First Line
%..............^changed here

Now both lines are rotating in equal manner, are you looking for this one?

[Neelesh Sharma]

Thankyou sir, but I am trying to plot L1 such that its initial point moves vertically down in straight line. It does that through the code but L1 and L2 are now not rotating simultaneously.

[KALYAN ACHARJYA]

Can you share any pictorial representation image (you can use use paint)?

[Neelesh Sharma]

The expected path traced by L1 and L2 are shown in the figure attached. But, L1 & L2 should in straight line while rotating.

[KALYAN ACHARJYA]

L1=60;
L2=15;
t=60;
for t1=t:-1:0
    plot([-L1*cosd(t1),0],[L1*sind(t1),0]);
    hold on
    grid on
    plot([0,L2*cosd(t1)],[0,-L2*sind(t1)]);    
    axis([-70 70 -70 70]);
    pause(0.1);
end

"But, L1 & L2 should in straight line while rotating"

Yes, Done, I have done minor changed only.

[Neelesh Sharma]

Thankyou sir, but the output figure should look like this.

[KALYAN ACHARJYA]

L1=60;
L2=15;
t=60;
for t1=t:-1:0
    plot([-L1*cosd(t),0],[L1*sind(t1),0]);
    hold on
    grid on
    plot([0,L2*cosd(t1)],[0,-L2*sind(t1)]);    
    axis([-70 70 -70 70]);
    pause(0.1);
end

You just need to avoid hold off line within the loop, else being the same. I set fixed starting points as its orignal code.

[Neelesh Sharma]

The lines L1 and L2 are not in straight line while tracing this path as shown in figure attached. They should be in straight line while tracing.

[KALYAN ACHARJYA]

First line, in my case

[Neelesh Sharma]

The lines L1 and L2 will be straight in the first line and last line but not in between as shown in fig attached. They should be in straight line always.