MATLAB read random line if line size is fixed

NUM_EXAMPLE = 6;
NOOFTRAINING = 6;
NOOFCHARPERLINE = 10 ;
NOOFOFFSETPERLINE = NOOFCHARPERLINE+ 2; % sometimes it maybe 2 depending upon whow data was written into file

fid = fopen( 'D:\KAUST\2.Winter2010-11\SpliceSites\test.txt','r');

for i=1: NOOFTRAINING

   rowno = round(rand(1)*NUM_SAMPLE) ;

   offset = (rowno - 1 ) * NOOFOFFSETPERLINE;
   fseek(fid,offset,'bof');
   line = fgetl(fid);
   frewind(fid);

   disp(rowno);
%    disp(offset);
   disp(line);

end

fclose(fid);

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