MATLAB: Matlab code problem in a S-function

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

Best Answer

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.
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