How can I change origin when creating a 2D plot. I need it to be at [pi,0].

```
x = 0:0.1:2*pi;
y = sin(x);
v = [x(: ) y(:)];
for theta = 0:0.05:2*pi
R = [cos(theta) sin(theta); -sin(theta) cos(theta)];
vr = v*R;
x = vr(:,1);
y = vr(:,2);
plot(x, y);
hold on; %boje
axis([-0.5 6.5 -4 4]);
pause(0.01);
endfor
```

Thanks!