Index exceeds matrix dimensions ERROR

Hi, can somebody figure out why I get this error message? Thank you very much!

Index exceeds matrix dimensions.

Error in gidilm1>localPlot (line 244)

line_h=line(t,XYData(:,cb),'UserData',cb,'ButtonDownFcn','gidilm1

line','Tag','lin','Color',col)%,'Marker','+');

Error in gidilm1 (line 95)

line_h(i)=localPlot(i,ax,colory(i-cbi+1,:));

Error while evaluating UIControl Callback

function line_h=localPlot(cb,ax,col)
global XYData t 
cb;
ax;
col;
line_h=line(t,XYData(:,cb),'UserData',cb,'ButtonDownFcn','gidilm1 line','Tag','lin','Color',col)%,'Marker','+');
axis(ax)
%axis([0 19.8 0.05 0.5])
axe=gca
%set(axe,'Xtick',[0:2:40])
xlabel('TEMPS (h)')
ylabel('DO')


% figure
   for i=cbi:cbf
   line_h(i)=localPlot(i,ax,colory(i-cbi+1,:));
   end

   ts=ax(1):50:ax(2)+60; 
   dos=doseuil.*(ones(1,length(ts)));
   line(ts,dos,'Color','b')

[Torsten]

I don't see a line where you assign values to "cbi" or "cbf".

[Alex Sune]

Here is the problem:

XYData(:,cb)

But we don't know the values of those variables. What is the result of

whos XYData
cb

[Mariaelena]

   case 'fboxcb'
   fileIndex=get(gcbo,'Value');
   fileList=get(gcbo,'String');
   filename=fileList{fileIndex};
   
   XYData=[];
   XYData=LocalGetData(filename);
   size(XYData);
   
   [imax jmax]=size(XYData);
   t=XYData(:,1)./60;
   XYData(:,1)=[];
   
   size(t);
   
   case 'regvcb'
  
   % Restoration of the threshold times
    j=0;
   % [t(1:100) XYData(1:50,cbi:cbf)]
   % [t XYData(:,1)];

   for cb=cbi:cbf
      k=0;
      j=j+1;
      i=4;
      l=[];
      while k <1  
         if XYData(i,cb)>dosupseuil
              k=1;
         end
         if and(XYData(i,cb)>doinfseuil,XYData(i,cb)<dosupseuil)
            l=[l;i];
         end
         if i==imax
            l=i-2:i-1;
            break
         end
         i=i+1;
      end
      yspline=XYData(l,cb)  
      xspline=t(l)
      P=polyfit(yspline,xspline,1);
      TD(j)=polyval(P,doseuil);
       %TD(j)=t(i);     
    end
    
    TD;  

Answer 1

[Jan]

Using global variables is a bad programming style. It impedes the debugging massively. It is hard to find out, which code has set the values of t, XData and cb the last time. Obviously these values contain a problem. Prefer to use input and output arguments instead. For sharing variables between callbacks: https://www.mathworks.com/matlabcentral/answers/?term=share+variables+between+callbacks

What is the meaning of these lines:

cb;
ax;
col;

?