Update figure after each loop

I created a circle plot and i want to draw lines on the circle based on user data. I want to refresh circle lines after every loop. E.g When i enter data for the first loop ,x=3,y=2,z=1,a=1 i want from figure to hold values from case (z=1 and a=1) (plot([0 1],[3 4.9],'b')) and for the second loop, z=1, a=2, i want the figure to be updated and give me lines from three plots :

plot([0 1],[3 4.9],'b');
plot([0 5],[6 4.9],'b');
plot([4 4],[4 4],'b');

How can i update the figure after every loop?

Below is my code

prompt=('Enter the primary features between 3 and 7: ');
 x = input(prompt);

 prompt=('Give the subfeatures:');
 y=input(prompt);
 
t=0; %counter to terminate for

for i=1:x
    
   
    prompt=('Give the position of the element:');
    z=input(prompt);
    
  
    prompt=('How many lines on this position?:');
    a=input(prompt);
    
    %prompt=('Give the subfeatures of the third layer:');
    %n=input(prompt);

    numPoints=100; %Number of points making up the circle
    radius=5;      %Radius of the circle

    %Define circle in polar coordinates (angle and radius)
    theta=linspace(0,2*pi,numPoints); %100 evenly spaced points between 0 and 2pi
    rho=ones(1,numPoints)*radius; %Radius should be 1 for all 100 points
    %Convert polar coordinates to Cartesian for plotting
    [X,Y] = pol2cart(theta,rho); 

    %Plot a red circle
    plot(X,Y,'r-','linewidth',2);
    axis square
  
    %Altering the radius allows us to plot a second circle within the first one

    radius=7;      %third circle
    rho=ones(1,numPoints)*radius;
    [X,Y] = pol2cart(theta,rho);
    hold on
    plot(X,Y,'k-','linewidth',2);
    hold off
 
   
    
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  
   if (x==3 & y==2) 
     
        t=t+1 %  counter 
        
        myfunc3();
        hold on;
        set(gcf,'visible','off')
        
        if (t==2)
            set(gcf,'visible','on')
            
        end
        
        switch z
            
            case z==1 & a==1
                
                if(t==2)
                plot([0 1],[3 4.9],'b');
               
                return
            end
                
            case z==1 & a==2
                
                if(t==2)
                plot([0 5],[6 4.9],'b');
                plot([4 4],[4 4],'b');
               
                return
            end
               
        end
   end

Answer 1

[Bob Thompson]

I suspect that you are having a challenge because you activate 'hold on' right after myfunc3(), but you don't deactivate it. This means that during the next loop, when you plot your original red circle it is keeping all of the original plots, instead of removing and replotting the two circles. This means that you plot the first case in the first loop, and then have both the first and second cases plotted in the second loop. Try putting 'hold off' at the end othe loop.

Unfortunately, I cannot test this directly because I do not have myfunc3(). If you wanted to post that here I could run the further tests myself.

[kpl]

I will test it and see if it works

Here is the code from myfunc3()

function myfunc3()

    numPoints=100; %Number of points making up the circle
    radius=5;      %Radius of the circle

    %Define circle in polar coordinates (angle and radius)
    theta=linspace(0,2*pi,numPoints); %100 evenly spaced points between 0 and 2pi
    rho=ones(1,numPoints)*radius; %Radius should be 1 for all 100 points
    %Convert polar coordinates to Cartesian for plotting
    [X,Y] = pol2cart(theta,rho); 

    %Plot a red circle
    plot(X,Y,'r-','linewidth',2);
    axis square
  
    %Altering the radius allows us to plot a second circle within the first one

    radius=7;      %third circle
    rho=ones(1,numPoints)*radius;
    [X,Y] = pol2cart(theta,rho);
    hold on
    plot(X,Y,'k-','linewidth',2);
    hold off

    radius=3;
    rho=ones(1,numPoints)*radius;
    [X,Y] = pol2cart(theta,rho);

    hold on

    plot(X,Y,'k-','linewidth',2);
    text(0,2,' 1','FontSize',14)
    text(1.5,-1.5,' 2','FontSize',14)
    text(-2,-1.5,' 3','FontSize',14)

    text(-1.3,4,'1.1','FontSize',14)

    x = linspace(0,0);
    y = linspace(0,3);
    z = linspace(0,2.6);
    t = linspace(0,-1.5*pi/3);
    a = linspace(0,-2.6);
    b = linspace(0,-1.5*pi/3);

    line(x,y)
    line(z,t)
    line(a,b)

   

    hold off

end

[Bob Thompson]

Thanks.

Further review has revealed that the first case is never printed, because it looks for when t==2, which does not happen except during the second loop. Therefore, the plot doesn't actually happen until the second loop.

[kpl]

Yes indeed. But how can we fix this?

[Bob Thompson]

Do you want to allow the first case to print on the first loop? Then just change the if condition which contains that plot. Set it to t == 1, instead of t == 2.

[kpl]

I want to print both cases together combined.

e.g first loop hold plot from case 1 and on the second loop plot case1+case 2 combined

[Bob Thompson]

If you want to have both cases, then remove all of the 'hold' commands, and replace them with a single 'hold on' command in front of the loop. Then you still need to replace the if statement to print the first line, but by the end both lines should be printed on the same plot.