intersections between circles and lines

I have a matrix with the coordinates x,y of start of some lines and the matrix with coordinates x,y of end of each lines. I have also a vector with the centers of the circles and a vector with the radius. I would find the intersection points of these lines with circles. If a line intersects a circle, it is colored red. At the moment I wrote this code:

hold on 
for i=1:3 
theta = 0 : 0.01 : 2*pi;
radius = 3;
x = radius * cos(theta);
y =radius * sin(theta);                                    
plot(x+xCenter(i), y+yCenter(i));
axis square;
grid on;
axis equal;
line(startxy,endxy)
end

For the moment I imposed a constant radius. You see a "cycle for" until 3 because I have imposed a vector with 3 rows, to try if the code works. Thanks for your help

Answer 1

[KSSV]

Have a look on this file exchange function: https://in.mathworks.com/matlabcentral/fileexchange/22441-curve-intersections

[gianluca scutiero]

I thank you for your response. The problem is that I use a function "line" that it is not supported by the function InterX

   for i=1:3
  t = 0:pi/200:2*pi;
  r1 = 3; x1 = r1.*cos(t); y1 = r1.*sin(t);
  r2 = line(startendx,startendy);
  P = InterX([x1+xCenter(i);y1+yCenter(i)],[line(startendx,startendy)]);
  plot(x1+xCenter(i),y1+yCenter(i),P(1,:),P(2,:),'ro')
  axis equal
  end

[KSSV]

Why to use line? You have to input coordinates for the curves.