function start_model_adaptive
format long
global no_of_chars cum_freq no_of_symbols char_to_index index_to_char freq
for ii=1:no_of_chars
char_to_index(ii)=ii+1;
index_to_char(ii+1)=ii;
end
for ii=1:no_of_symbols
freq(ii)=1;
cum_freq(ii)=no_of_symbols-ii;
end
freq(1)=0;