calssdef varible are overwriten using classdef function

hello

i have a classdef that i created. i want to create difrent varible in that class.

lets say rob 1 and rob 2.

when i create rob2 (after creating rob1),rbo1 it's overwriten by rob2 ( so they are the same)

i could i fix that? i rather not change the classdef code.

thank u!

classdef cRobot < handle
     
   properties 
     
      % pose
      x;
      y;
      theta;
      
      % noise
      forward_noise = 0;
      turn_noise    = 0;
      sense_noise_range   = 0; 
      sense_noise_bearing = 0;
     
      
   end
   
   methods
       
      function obj = cRobot % method constructor
      
          % place robot with a random pose
          obj.x = rand*cWorld.world_size;
          obj.y = rand*cWorld.world_size;
          obj.theta = rand*2*pi;
          
          
      end
           
       % sets the new pose
       function  obj = set(obj,new_x,new_y, new_orientation)
           
           
         if (new_x < 0 | new_x >= cWorld.world_size)
            error('X coordinate out of bound');
         end
         
         if (new_y < 0 | new_y >= cWorld.world_size)
            error('Y coordinate out of bound');
         end
            
         if (new_orientation < 0 | new_orientation >= 2 * pi);
            error('Orientation must be in [0,2pi]');
         end
            
        
         obj.x = new_x;
         obj.y = new_y;
         obj.theta = new_orientation;
        
         
       end
       
       % prints the pose of the robot to the Matlab prompt
       function   print(obj)
           format long
           display(['[x= ',num2str(obj.x), '  y=', num2str(obj.y), '  heading=', num2str(obj.theta),']']);
           
       end
       
       % plots the pose of the robot in the world
       function plot(obj,mycolor,style)
           
             if(nargin == 1)
                 mycolor = 'b'; % default
                 style = 'robot'
             end
             
             if(nargin == 2)
                 style = 'robot'; % default
             end
           
             hold on;
           
             
             % different plot styles for the robot
             switch style
                 
                 case 'robot'
                     
                     % size of robot
                     phi = linspace(0,2*pi,101);
                     r = 1;
                     
                     
                         % plot robot body
                         plot(obj.x + r*cos(phi),obj.y + r*sin(phi),'Color',mycolor);
                         hold on;
                         % plot heading direction
                         plot([obj.x, obj.x + r*cos(obj.theta)],[obj.y, obj.y + r*sin(obj.theta)],'Color',mycolor);
                         
                         axis equal;
                    
                     
                 case 'particle'
                     
                     
                         % plots robot position but ignores heading
                         plot(obj.x,obj.y,'.','Color',mycolor,'MarkerSize',10);
                         
                     
                     
                 otherwise
                     
                     disp('unknown style');
                     
             end
             
              xlim([0,cWorld.world_size]);
              ylim([0,cWorld.world_size]);
                     
       end
           
       % sets new noise parameters
       function obj = set_noise(obj, new_forward_noise, new_turn_noise, new_sense_noise_range, new_sense_noise_bearing)
          obj.forward_noise = new_forward_noise;
          obj.turn_noise    = new_turn_noise;
          obj.sense_noise_range   = new_sense_noise_range;
          obj.sense_noise_bearing   = new_sense_noise_bearing;
       end
      %move function
       function obj = move(obj,u1,u2)
         u1 = u1 + normrnd(0,obj.turn_noise);
         u2 = u2 + normrnd(0,obj.forward_noise);
         obj.x     = obj.x + u2*cos(obj.theta+u1);
         obj.y     = obj.y + u2*sin(obj.theta+u1);
         obj.theta =obj.theta + u1;               
       end
     
       function mess = sense(obj)
             for i =1:6
                 mess(i,1) = sqrt((cWorld.landmarks(i,1)-obj.x)^2+(cWorld.landmarks(i,2)-obj.y)^2) + normrnd(0,obj.sense_noise_range);
                 mess(i,2) = atan2(cWorld.landmarks(i,2)-obj.y,cWorld.landmarks(i,1)-obj.x) - obj.theta + normrnd(0,obj.sense_noise_bearing);
            end
         end
       
      function p = measurement_probability(mess)
    
         end 
   end

end

[Steven Lord]

Can you show us the code you run to create rob1 and rob2 as instances of your cRobot class? I suspect I know what you're doing to see the behavior you describe, but seeing the code will help me be certain.