How fix speed of 3 For loops?

Hello

I have animated a proceess in GUI and used For loop to create animation of a mixing tank .However, the problem is my loop will work slow ecah ime more than before?

I am nott sure anyone know how to fix the problem?

Codes are provided below ,it is only to start button's function:

function start_Callback(hObject, eventdata, handles)
% hObject    handle to start (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA
%set(handles.stop_Callback, 'userdata', 0);
set(handles.stop,'userdata',0); 
set(handles.pause,'userdata',0);%defining the value of the pause-button 
set(handles.emergency_stop,'userdata',0);%defining the value of the emergency-stop-button
set(handles.reset,'userdata',0);

   if get(handles.reset,'userdata')% getting the response from Emergency-stop button
        title('Process is reset')   %creating title 
      return; %%stop process
    end
    
   axis([-10 10 -15 15]) 
     
for loop2=1:3 %it is a General Loop which loops all process
     title('stop button is applied')   %creating title
     if get(handles.stop,'userdata')% getting the response from stop button
        set(handles.stop,'userdata',1); %setting value of stop button
        break; %stopping loop
     end
    
  if get(handles.pause,'userdata')%getting the response from pause button
        uiwait(handles.figure1); %UIWAIT makes Guide wait for getting continue button's response 
        title(' process is paused') %creating title
  end
  
  
  if get(handles.emergency_stop,'userdata')% getting the response from Emergency-stop button
     title('process is stopped as Emergency') %creating title        
     break; %Stopping loop 
  end
      %...................plotting pipes/product A       
      x=[2.1 8];    % mentioning value of x
      y=[9.5 9.5];  %mentioning value of y
      plot(x,y,'Color','yellow','LineWidth',7)% drawing pipe
      
      ...................plotting pipes/product A
     x1=[2.3 2.3];    % mentioning value of x
     y1=[9.5 7];      %mentioning value of y
     plot(x1,y1,'Color','yellow','LineWidth',7)% drawing pipe
              
     ................................filling animation
     x1=[2.3 2.3];   % mentioning value of x
     y1=[0 7];        %mentioning value of y
     plot(x1,y1,'--','Color','yellow','LineWidth',7)% drawing pipe
   %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%  
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
      level=0;% creating variable
      level_h= randi(1)*25; %Percentage of tank volume
       pause(0.001)
      %Filling tank with product A/opening valve1........................................
 for i=1:level_h   % Filling tank with product A /Opening valve 1
     pause(0.001)
     if get(handles.pause,'userdata')%% getting the response from pause button
        uiwait(handles.figure1);  %UIWAIT makes Guide wait for getting continue button's response  
      end
      if get(handles.reset,'userdata')% getting the response from rese-button
       break;
      end
   
     level=level+0.15;  %%%level of liquid
     %%%%plotting level of liquid 
     patch([-4.4  4.15 4.15 -4.4],[ 0 0 level level]-7.05,'yellow');%Starting line
     x5=[0 0];
     y5=[-4 11];
     plot(x5,y5,'Color','black','LineWidth',12)
     hold on
     x6=[-2 2];
     y6=[-4 -4];
     plot(x6,y6,'Color','black','LineWidth',12)
     hold on
     rectangle('Position',[-3 -5 2 2.25],'FaceColor','black')
     rectangle('Position',[1 -5 2 2.25],'FaceColor','black')
     pause(0.001)   % delay time 
     W=8;         %defining wiedth of the tank's body
     L=8;        %defining length of the tank's body
     H=level;     %defining height of the tank's body
     V=(W*L*H);   %computing volume of the tank
     disp(V);     %diplay the value of the tank
     set(handles.text1,'String',V);
     title(['Filling Tank// Vlave1 is open:',num2str(level_h),'%']); %writting Title
     drawnow        %animating procces
  
  end   
  

     pause(0.001)  %making delay
    level_h=randi(1)*75; %Percentage of tank volume
    ....................plotting pipes
     x=[2.1 8];       % mentioning value of x
     y=[9.5 9.5];   % mentioning value of x
     plot(x,y,'Color','blue','LineWidth',7) %Drawing pipe
      
      ...................plotting pipes
     x1=[2.3 2.3];   % mentioning value of x
     y1=[9.5 7];     % mentioning value of y
     plot(x1,y1,'Color','blue','LineWidth',7)  %Drawing pipe  
     .................removing aniamtion of product A
     x1=[2.3 2.3];   % mentioning value of x
     y1=[0 7];        % mentioning value of y
     plot(x1,y1,'--','Color','white','LineWidth',7) %Drawing liquid  
     
    ................plotting pipes/product B
      x=[-2.1 -8];      % mentioning value of x
      y=[9.5 9.5];    % mentioning value of y
      plot(x,y,'Color','cyan','LineWidth',7)  %Drawing liquid inside pip
     
      ................plotting pipes/product B
     x1=[-2.3 -2.3];    % mentioning value of x
     y1=[9.5 7];        % mentioning value of y
     plot(x1,y1,'Color','cyan','LineWidth',7)  %Drawing liquid inside pip
    
     ..........................animatting filling by product B
      x1=[-2.3 -2.3];  % mentioning value of x
      y1=[0 7];         % mentioning value of y
      plot(x1,y1,'--','Color','cyan','LineWidth',7)%Drawing liquid inside tank  
      pause(0.01)        % delay time 
    
    %%%%%%%%%%%%%%%%Filling tank with product B %%%%%%%%%%%%%%%%%%%%%%%%%%%%
   %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    pause(2);
 for i=6:level_h  
      if get(handles.pause,'userdata')% getting response from pause-button
        uiwait(handles.figure1);    %UIWAIT makes Guide wait for getting continue button's response
      end
     if get(handles.emergency_stop,'userdata') % getting the response from Emergency-stop button
        title('process is stopped as Emergency') %creating title 
       break;  %stopping loop  
     end
  
       level=(level+0.150); %%%level stpoint
       %plotting level of liquid >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
      patch([-4.4 4.15 4.15 -4.4],[ 0 0 level-3.60 level-3.60]-3.70,'cyan');%Starting line
      x5=[0 0]; % mentioning value of x
      y5=[-4 11]; % mentioning value of y
      plot(x5,y5,'Color','black','LineWidth',12)
 
      x6=[-2 2]; % mentioning value of x
      y6=[-4 -4]; % mentioning value of y
      plot(x6,y6,'Color','black','LineWidth',12)
  
      rectangle('Position',[-3 -5 2 2.25],'FaceColor','black')
      rectangle('Position',[1 -5 2 2.25],'FaceColor','black')
     if get(handles.reset,'userdata')% getting the response from reset-button 
       break; %stopping loop
    end
       
       pause(0.001) % delay time 
       %%%.............computing vloume of Tank
       H=level;  %Height of tank's body
       W=8;      %weidth of tank's body
       L=8;     %lenght of tank's body
       V=((W*L*H)); %computting the volume of the liquid
       disp(V);      %display value of the volume
       set(handles.text1,'String',V);% setting value of text box
       title(['Filling Tank//valve1 closed// Valve2 is open//Mixer is ON:',num2str(level_h),'%']); %creating Title
       drawnow   %animating procces
       rectangle('Position',[-3 -5 2 2.25],'FaceColor','red');
       rectangle('Position',[1 -5 2 2.25],'FaceColor','red');
       pause(0.01)% making delay
       rectangle('Position',[-3 -5 2 2.25],'FaceColor','black');
       rectangle('Position',[1 -5 2 2.25],'FaceColor','black'); 
      drawnow%animating process 
     
 end  
    

      %%%%%%%%%Starting to Empty Tank%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
      %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
     pause(1);%making delay
     title('EMPTY TANK// Valve2,valve1 are closed ,Drain valve is open now')% making titile

  for i=10:level_h  % draining tank's Loop
     if get(handles.pause,'userdata')%getting the response from pause button 
         uiwait(handles.figure1);   %UIWAIT makes Guide wait for getting continue button's response
     end  
     if get(handles.emergency_stop,'userdata') % getting the response from Emergency-stop button
       break;  %stopping loop  
     end 
     if get(handles.reset,'userdata')% getting the response from Emergency-stop button
       break;%stopping loop 
     end
    
       
     H=level;  %Height of tank's body
     W=8;      %weidth of tank's body
     L=8;     %lenght of tank's body
     V=((W*L*H)); %computting the volume of the liquid
     disp(V);      %display value of the volume
        ................plotting pipes/product B
      x=[-2.1 -8];      % mentioning value of x
      y=[9.5 9.5];    % mentioning value of y
      plot(x,y,'Color','blue','LineWidth',7) %drawing pipe
     
      ................plotting pipes/product B
     x1=[-2.3 -2.3]; % mentioning value of x
     y1=[9.5 7];     % mentioning value of y
     plot(x1,y1,'Color','blue','LineWidth',7)  %drawing pipe
        
       .....................plotting pipes/Drain pipes
       x2=[0 0];      % mentioning value of x
      y2=[-10 -7.05]; % mentioning value of y
      plot(x2,y2,'--','Color','green','LineWidth',7)%DRAWING PIPE
    
      ....................plotting pipes/Drain pipes
     x3=[-0.2 8];   % mentioning value of x
     y3=[-10 -10];  % mentioning value of y
     plot(x3,y3,'--','Color','green','LineWidth',7) %DRAWING PIPE
     pause(0.01)%making delay
     %plotting empty Tank>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
     patch([-4.4  4.15 4.15 -4.4],[0  0  level level]-7.05,[1 1 1],'Edgecolor','white');%Ending level/plotting components
     level=level-0.2150;% setting tank's level
     patch([-4.4  4.15 4.15 -4.4],[0  0  level level]-7.05,'green');%Starting level
     %.................
    
     H=level;  %Height of tank's body
     W=8;      %weidth of tank's body
     L=16; %lenght of tank's body
     V=((W*L*H)); %computting the volume of the liquid
     disp(V);      %display value of the volume
     set(handles.text1,'String',V);
     %....................................plotting Mixer
     x5=[0 0];  % mentioning value of x
     y5=[-4 11];  % mentioning value of y
     plot(x5,y5,'Color','black','LineWidth',12)
     hold on % keeping visible
     x6=[-2 2]; % mentioning value of x
     y6=[-4 -4];% mentioning value of y
     plot(x6,y6,'Color','black','LineWidth',12)%plotting mixer
     hold on % keeping visible
     rectangle('Position',[-3 -5 2 2.25],'FaceColor','black')%plotting mixer
     rectangle('Position',[1 -5 2 2.25],'FaceColor','black') %plotting mixer
       
       pause(0.001)% delay time 
       drawnow%animating process
      
   end  
   
   title(' Drain-valve closed-End of Process')% making title

     .....................plotting pipes/Drain pipes
       x2=[0 0];       % mentioning value of x
      y2=[-10 -7.05];  % mentioning value of y
      plot(x2,y2,'Color','blue','LineWidth',12)
      
      ....................plotting pipes/Drain pipes
     x3=[-0.1 8];       % mentioning value of x
     y3=[-10 -10];      % mentioning value of y
     plot(x3,y3,'Color','blue','LineWidth',12)
     clc;              %cleaning the command window
     
     if get(handles.emergency_stop,'userdata') % getting the response from Emergency-stop button
       title('process is stopped as Emergency') %creating title
       break;  %stopping loop  
     end 
     if get(handles.reset,'userdata')%getting the response from reset-button
         title('Process is reset')  %creating title  
         break;    %stopping loop
     end
      
     drawnow%animating process   
    
end
  return;

Answer 1

[Animesh]

Hello Keyvan,

It seems like your code is slowing down due to the extensive use of pause and drawnow functions inside your loops. These functions are known to slow down the execution of loops in MATLAB. Here are a few suggestions that might help:

1. Minimize the use of pause and drawnow: These functions force MATLAB to halt execution or update figures, which can be time-consuming, especially in a loop. If possible, try to call these functions less frequently.
2. Preallocate Memory: If you’re working with arrays or matrices, preallocating memory can significantly improve performance. For example, if you’re working with an array that grows with each iteration, predefine the size of the array before the loop.

To read more about preallocation, please refer to the following link -https://www.mathworks.com/help/matlab/matlab_prog/preallocating-arrays.html

I hope I was able to help you.