Write Dataset in text file using matlab

X= pop_loadset();
savefile = 'C:\temp.txt';
myfile = fopen(savefile ,'wt');

for i=1:X.nbchan
fprintf(myfile,'%g***** ',i);
fprintf(myfile, '%f\t',X.data(i,:));
fprintf(myfile,'\n');
end
fclose(myfile);