MATLAB: “Index exceeds matrix dimensions” Error. solution please.

error

x1=60;x2=40; y1=40; y2=60;
 d = sqrt((x2-x1)^2+(y2-y1)^2); 
  a = atan2(-(x2-x1),(y2-y1)); 
  b = asin(d/2/r); 
 c = linspace(a-b,a+b); 
  e = sqrt(r^2-d^2/4); 
  x = (x1+x2)/2-e*cos(a)+r*cos(c); 
  y = (y1+y2)/2-e*sin(a)+r*sin(c);
  axis([0 150 0 150])
 hold on
 plot(x,y,'r'); 
axis([0 150 0 150])
h1 = plot(x(1),y(1),'bs','MarkerSize',7,'MarkerFaceColor','r'); 
for n = 1:numel(t)
set(h1, 'XData', x(n), 'YData', y(n));   %HERE
drawnow %// refresh figure
end
The error is displayed in the highlighted line.
suggest solution. (what should be the value of t here)
Here, the program runs even without specifying the value of t. how is it possible?
Can the speed of the pointer be controlled (in terms of frequency/velocity) by the user given input (from dialog box)?

Best Answer

You have an old t variable sitting around or passed in,and it is longer than your x is.
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