MATLAB: Strcmp Error

input argumentstrcmp error

I am getting the following error:
Error using ==> strcmp
Not enough input arguments.
Error in ==> EFT at 150
    if sum(strcmp(n.subject,subNames))
Here is the section of code:
numSubjects = 0;
allSubjects = cell(round(numFiles/4),1);   
subNames    = cell(round(numFiles/4),1); 
maxNumStims = 0;
header('Reading Gaze Data',numFiles);
for i = 1:numFiles
    rem = numFiles-i;
    fileName=Q(i).name;    
    fileDate=Q(i).date;
    walltime=str2num(fileDate(end-1:end)) + ... 
        60*str2num(fileDate(end-4:end-3)) + ...
        60*60*str2num(fileDate(end-7:end-6));
    theFile=[pathh fileName];
    gd = readGazeData(theFile,numHeaderLines,cols);
    gd.walltime = walltime;
    gd.requireBothEyes = requireBothEyes;    
    allGazeData{i} = gd;
    pat = 'B(?<block>\d) (?<type>[A-Z][A-Z]).+(?<subject>\d\d\d\d[.]\d\d)';
    n = regexp(Q(i).name, pat, 'names');
    blockNum = str2num(n.block);
    allGazeData{i}.blockNum = blockNum;
    if sum(strcmp(n.subject,subNames))
        ind = find(strcmp(n.subject,subNames));
Does anyone know why I am getting this error? Thank you

Best Answer

Please consider the possibility that
n = regexp(Q(i).name, pat, 'names');
might return empty.
You are running the regexp() against what looks like a file name rather than against (say) the gaze data.
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