problem with my obstacle avoidance code

hi i am using this code for circle generation

   function h = circle(x,y,r)

hold on
th = 0:pi/50:2*pi;
xunit = r * cos(th) + x;
yunit = r * sin(th) + y;
h = plot(xunit, yunit);
hold off

1. The obstacles are defined as circles
2. when i try to callt the function from another script file it seemed fine at once but the next time when i tried doing it i got this error

"Error in ci1 (line 2)

circle =ci(300,500,20);
  function h = ci(x,y,r)

Error: Function definitions are not permitted in this context."

i have developed the logic for the collision avoidance that is

    if %touching internally 
  if(c= = rless)
    disp('there is collison');
    % circles intersecting 
  else
      if (c>=rless)
          disp('there is collision');
  %touching externally 
      else
          if (c= = rsum)
              disp('there is a collision');
              % circle inside another circle
          else 
              if (c< rmod)
                  disp('there is a collison');
                  % if there is no collision
                  if(c>rsum)
                      disp('there is no collision');
                  end
              end
          end
      end
  end
  % where rless=|r1-r2|
  % where rsum=r1+r2
  %rmod=|r2-r1|
  %where c is the distance between two circle centers (x1,y1) and(x2,y2)

• # This is just the rough idea of the logic i intend to apply at the calling script file
• # That is where the function of the circles are called can you please help me sort this out

thank you in advance

[passioncoding]

Can you kindly share your matlab code for collision avoidance.

Answer 1

[Image Analyst]

What does line 1 say? It better say

function ci1()

or else you'd get that error. Also, you can't do this

if(c= = rless)

you cannot have a space in between two equal signs. You probably want

if c == rless

Answer 2

[Walter Roberson]

Functions need to be stored in .m files to be called upon.

Also in any one .m file, you can have functions (the file starts with "function"), or class definitions (the file starts with "classdef"), or script instruction (the file starts with anything else), but you cannot mix those. A script file cannot also define a function. You can have multiple functions in one .m though:

function ci1
  circle = ci(300,500,20);
end
function h = ci(x,y,r)
  ...
end

[engesraa]

how can i avoid a collision with square obstacles ???

[Walter Roberson]

Testing a square is easy if it is aligned with the axes: left <= x & x <= right & bottom <= y & y <= top

[Walter Roberson]

Note: effective R2016b it became possible to define functions at the bottom of script files.