Matlab code problem in a S-function

Hi, I have this loop in my code:

   global counter
   T=200
   if counter>=T
   counter=0
        .
        .
   else counter=counter+1
   end

This code worked fine yesterday and now no, but I have not changed anything. Until yesterday, the answer was

counter =

       1
   .
   .
  counter =

       200

and now:

counter =

       []
   .
   .
  counter =

       []

Please help me

Answer 1

[Image Analyst]

When you enter the routine counter is null for some reason. Probably some other part of your code did it. Change the line

if counter>=T

to this

if isempty(counter) || counter >= T

That should make it not null anymore.

[alessandro]

perfect, it works. Thank you

[Image Analyst]

Can you mark the Answer as "Accepted" then? Thanks.