How can the arrow remain on the graph whilst the the other plots are produced?

i have this code which creats an arrow. However it doesn't work when combined with my code for an animated plot.

x = [-1  , 1/3, 1/3, 1, 1/3, 1/3,-1  ];
y = [-1/3,-1/3,-1/2, 0, 1/2, 1/3, 1/3];
g = hgtransform;
patch('XData',x,'YData',y,'FaceColor','red','Parent',g)

This one simulates movement

close all 
clear    
clc     

disp ('The terrain has many obsticles which your robot must a manuver around to move forward') 
prompt = 'How far forward, in meters, did your bot tranvel? ';
n = input (prompt);    

if n <= 0
    disp 'Objects are not permitted to move backwards. Please retry'
end

if n >= 1
    
%% Oject coordinates

t = 0:0.1:n; 
y = sin(t);     
y2 = cos(t);    



for k = 1:length(t) 
    
  %% Marker plots
  
   plot(t(k),y(k),'x') 
   hold on     
   plot(t(k),y2(k),'o') 
   hold on     
   
   %% Line plots
   
   plot(t(1:k),y(1:k)) 
   hold on
   plot(t(1:k),y2(1:k))
   
   
   %% Graph properties 
   
   axis([0 n*1.0005 -1 1]) %Allows for easier viewing of the plotting and sets a focus over these points of the graph
   view(2); % Changes the default/2d to a 3 dimensional graph
   grid on % Turns on the grid lines for the graph
   xlabel('Forward Movement') %Labels the x axis 
   ylabel('Left and Right Movement') %Labels the y axis
   legend('sin(t) marker', 'cos(t)marker', 'sin(t)','cos(t)') % Adds a key to the corner graph.
   pause(0.1) % Pauses the complete plotting of the graph and allows it to happen one at a time with each frame. 
    
     if k~=length(t)
     clf   %Clears all the x and o markers from the frame of the graph,except for the last points

       
     end
   
end

end

Answer 1

[Sulaymon Eshkabilov]

close all % already takes care of your issue

To avoid overlapping of the animated plot with legend, you may need to consider this syntax:

  legend('sin(t) marker', 'cos(t) marker', 'sin(t)','cos(t)', 'location', 'best')

Answer 2

[Walter Roberson]

clear    

You are relying on the fact that clear does not remove graphic objects and so will delete the variable named g that you already created, but will not remove the patch object ???

clf   %Clears all the x and o markers from the frame of the graph,except for the last points

You need to understand clf as meaning the equivalent of

delete(findall(gcf))

Which is to say that your clf() call is definitely going to delete the patch() object you created. Oh, and it is also going to delete the "last points", no "except" about it. But it is going to delete all axes, all colorbars, all legends, all uicontrol, all other graphics objects inside the figure.

I would suggest you create a small number of graphics objects:

1. One patch() object
2. One line() object with markers
3. One animatedline object

Then, each cycle, update the XData and YData properties of the line() object in order to move the marker, and use addpoints() to update the "trail" that you are drawing.

No plot() inside the activity loop, no clf() inside the activity loop. Nothing other than updating properties of existing objects, and drawnow() to ask the screen to be updated.