function write_file(input, file, nb_words_per_line, words_format)

input_format = '';
for i=1:nb_words_per_line
    input_format = strcat(input_format,words_format);
end
input_format = strcat(input_format,'\n');
fin = fopen(file,'w');
fprintf(fin,input_format,input);
fclose(fin);
end