display of curve information matlab

hi everyone, i use this code :

rep = uigetdir;
Imgs = dir(rep);
thisname = Imgs(3).name;
[path,name,ext]=fileparts(thisname);
ext=strcat('*',ext);
chemin = fullfile(rep,ext);
list = dir(chemin);
nbr_images= numel(list);
for n=1:25
k=dicomread(fullfile(rep, list(n).name));
end;
IM=double(k);
figure(1),imshow(IM,[]);
impixelinfo;

[xi1,yi1] = getpts()
[xi2,yi2] = getpts()
[xi3,yi3] = getpts()
[xi4,yi4] = getpts()
[xi5,yi5] = getpts()
[xi6,yi6] = getpts()

x1= round(xi1);
y1= round(yi1);

    x2= round(xi2);
    y2= round(yi2);
    
    x3= round(xi3);
    y3= round(yi3);
    
      x4= round(xi4);
    y4= round(yi4);
    
      x5= round(xi5);
    y5= round(yi5);
    
      x6= round(xi6);
    y6= round(yi6);
    
   
    
IM=dicomread(fullfile(rep, list(1).name))
IM(1,1,numel(list))=0; %extend array to fit all slices
for n=2:numel(list)
    IM(:,:,n)=dicomread(fullfile(rep, list(n).name));
end


for n=1:25
    X1=squeeze(IM(x1,y1,:));
    X2=squeeze(IM(x2,y2,:));
    X3=squeeze(IM(x3,y3,:));
     X4=squeeze(IM(x4,y4,:));
    X5=squeeze(IM(x5,y5,:));
    X6=squeeze(IM(x6,y6,:));
    
  figure(1),plot(X1,'b*-');
   xlabel('Cycle cardiaque');
ylabel('intensité');
title('Courbe six segments');
    set(gca,'Xtick',1:1:25); 
    set(gca,'Ytick',0:10:255); 
    hold on; plot(X2,'y*-'); plot(X3,'r*-'); plot(X4,'g*-'); plot(X5,'m*-'); plot(X6,'k*-');hold off;
    
end

I get this curve:

i wand to add this :

any help?

Answer 1

[Matt J]

See Add Legend to Axis.

[Amal Felhi]

thank u