MATLAB: Got some problems when trying to plot with a shifting angle in 2D Plotting

2d plottinga shifting angleplotproblems

when i try to plot from (0,0) it becomes great as the below Pic :
The Codes Are :-
hold on;grid;
ang=30;
theta=0;
for i=0:(360/ang)
xl=[0 15*cos(theta*pi/180)];
yl=[0 15*sin(theta*pi/180)];
plot(xl,yl,'-r')
theta=(i+1)*ang;
end
But when i try to change the Co-ordinates it becomes like this :-
The Codes As Below :-
hold on;grid;
ang=30;
theta=0;
for i=0:(360/ang)
xl=[5 20*cos(theta*pi/180)];
yl=[5 20*sin(theta*pi/180)];
plot(xl,yl,'-r')
theta=(i+1)*ang;
end
Thanks & Sorry for long words 😀

Best Answer

The posted code moves the start points from (0,0) to (5,5) and the end points of each line are located on the circle around (0,0) with radius 20. I guess that you want a circle around (5,5) with radius 15:
hold on;grid;
ang=30;
theta=0;
for i=0:(360/ang)
  xl = [5, 5 + 15*cos(theta*pi/180)];
  yl = [5, 5 + 15*sin(theta*pi/180)];
  plot(xl,yl,'-r')
  theta = (i+1)*ang;
end
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