MATLAB: Selecting rows from a file starting with a letter followed by 3 numbers

selecting rows

Hi there, I have a function that selects information from two files and combines this information into one new file. Importantly, I only want certain rows from file 2 to be included in the new document, namely rows for which the second column starts with 'S1' (followed by 2 other random numbers, eg: S124, S132, S112 etc.). Below is my code. I don't get an error message, however, it also does not give me the file I want. It prints only the header of the new file, but not the newly compiled lines. What am I doing wrong?
function []=CreateNewMarkersEEGlab(pNumber)
  dataFileName=strcat(int2str(pNumber),'_logfile.txt');
  fid = fopen(dataFileName);
  C = textscan(fid, '%s%s%s%s%s%s%s%s%s%s%s%s%s%s', ...
                  'headerlines', 1);%14 columns
  rScore=C{12}; 
  sNumber=C{5};
  cNumber=C{6};
  subNumber=C{7};
  tcode=C{10}; 
  fclose(fid);
  % compute the new marker
  for i=1:156
    if strcmp(rScore{i}, '1')
      respMarker='corrresp';
    else
      respMarker='incorrresp';
    end
    if strcmp(tcode{i},'1')
      corrMarker='corr';
    else 
      corrMarker='incorr';
    end
    newMarker{i} = sprintf('S1_con%s_sub%s_%s_%s_Snr_%s', ...
                    cNumber{i}, subNumber{i}, corrMarker, ...
                    respMarker, sNumber{i}); 
  end
  % read the old marker file
  dataFileName=strcat('EEG_Anne_',int2str(pNumber),'.vmrk');
  fid = fopen(dataFileName);
  headline1=fgets(fid);
  headline2=fgets(fid);
  headline3=fgets(fid);
  ...
  headline13=fgets(fid);
  C = textscan(fid, '%s%s%d%d%d','Delimiter',',');
  Type=C{1};
  Stimulus=C{2};
  Position=C{3};
  Length=C{4};
  Channel=C{5};   
  fclose(fid);
  % rewrite the new marker file
  outFileName=strcat('EEG_Anne_',int2str(pNumber),'_new.vmrk');
  fid = fopen(outFileName,'w+');
  fprintf(fid,headline1);
  fprintf(fid,headline2);
  fprintf(fid,headline3);
  ...
  fprintf(fid,headline13);
  for i=1:156
    if strcmp(Stimulus,'S1\d*')
      fprintf(fid, '%s,%s,%d,%d,%d\r\n', ...
          Type{i}, newMarker{i}, Position(i), Length(i), Channel(i));
    end
  end
  fclose(fid);

Best Answer

Not much can do w/o data file, but you can do what we can...
doc debug
Set a breakpoint and work thru the function to see where it fails.
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