Using textscan  ================== fid =  fopen(fname,'r'); C1=textscan(fid,'%s'); C1 = C1{1};// convert cell array to string   fclose(fid);   Convert cell array into set of string  ============================   C1  = C1{1};// convert cell array to string      Using textread  =============   1. READING FILES WITH DIFF FORMAT OF DATA INTO CELL ARRAY   data = textread(fNamePPM,'%s','delimiter','\n','whitespace','\t');   2. CONSIDER EACH LINE IN CELL ARRAY    myrow = sscanf(data{i} ,'%f\t%f\t%f\t%f' );   3.  ACCESS ENTRY OF A CELL ARRAY    if  celarr{i}(j) =='>'   end