Why and how can i fix the vert cat error in this code? It works fine with a 3 len string but over that i get a vert cat error

function PeaksFlare_Callback(hObject, eventdata, handles)
    global s;
    set(handles.text12,'String','');
    for w=1:length(s)
       e=get(handles.text12,'String');
       e=[e;num2str(w),'. ',num2str(s(w))];
       set(handles.text12,'String',e);
    end

      set(handles.text11,'visible','on');

      set(handles.text12,'visible','on');

Answer 1

[Walter Roberson]

You set "e" as a string, and then you try

e=[e;num2str(w),'. ',num2str(s(w))];

This tries to put (num2str(w),'. ',num2str(s(w))) as a new row in "e". How long is that string going to come out? If it doesn't happen to come out as exactly the same number of columns as "e" already is, you are going to have a problem.

You can change the code as

    for w=1:length(s)
       e = cellstr( get(handles.text12,'String') );
       e{end+1} = [num2str(w),'. ',num2str(s(w))];
       set(handles.text12,'String',e);
    end

Answer 2

[Geoff]

What value of s works, and what value of s breaks? Is s a string or an array of numbers?

You need to ensure that length(s) is less than 10 for this code to work. If s is not a string, you need to ensure that num2str(s(w)) is always the same length. You might consider using sprintf and specify padding etc in the format specifier.

eg

e = [e; sprintf('%2d. %c', w, s(w))];    % s is string
e = [e; sprintf('%2d. %-3d', w, s(w))];  % s is up to 3-digit int.
% etc....

Also, I would avoid the constant set and get calls, when you can do it with one set. Who knows - maybe that is what's causing problems:

e = [];
for w=1:length(s)
  e = [e;num2str(w),'. ',num2str(s(w))];
end
set(handles.text12,'String',e);

Hope that helps.