Problem with fileread when used in the code but when used all by itself it works. Why?

Hi,

I have an output file that I am trying to read and scan for a certain phrase. If that phrase is in the output file then the loop in my code can continue. If not I want to terminate it. The phrase is 'TWOPNT: SUCCESS'. This is the code I have as of now:

     Pattern = 'TWOPNT:  SUCCESS'
      A = fileread('OppDiff_HTPB_N2O.out') 
      B = strfind(A,Pattern)
      empty = []   %what B will spit out an empty matrix if the pattern is not 
                   %found in the file 

      if isequal(size(empty), size(B))
        disp('No TWOPNT success found...may be a convergence problem')
        error_message = 'No TWOPNT: SUCCESS found'
      break  
      else %if the B matrix is not empty
        disp('TWOPNT appears to have been successful! Conitnuing...')
      endif

I made this part of my code and ran it by itself and it worked fine. However when I went to input it into my overall code it gets to this section and it goes to the fileread and spits out A=>> and stops working. Is there a certain size limit? If so why did it work when I used it outside of the code but not in it? Thanks.

[Paige Nardozzo]

Sorry this is the code

   Pattern = 'TWOPNT:  SUCCESS'
      A = fileread('OppDiff_HTPB_N2O.out') 
      B = strfind(A,Pattern)
      empty = []   %what B will spit out an empty matrix if the pattern is not 
                   %found in the file 

      if isequal(size(empty), size(B))
        disp('No TWOPNT success found...may be a convergence problem')
        error_message = 'No TWOPNT: SUCCESS found'
      break  
      else %if the B matrix is not empty
        disp('TWOPNT appears to have been successful! Conitnuing...')
      endif

[Paige Nardozzo]

I made this part of my code and ran it by itself and it worked fine. However when I went to input it into my overall code it gets to this section and it goes to the fileread and spits out A=>> and stops working. Is there a certain size limit? If so why did it work when I used it outside of the code but not in it? Thanks.