Error encoding with Huffman in Matlab - matlab

Question

I have a file where i can read the next example of characters:
HP†d€H EPŠ€E iEPƒ1€E OGP†d€G HP†d€H JP†d€J LP†d€L.......
And when I try to encode the samples of the file using the function of Matlab "huffmanenco" Matlab says me this:
Error using huffmanenco (line 86)
The Huffman dictionary provided does not have the codes for all the input
signals.
Error in RETO2 (line 35)
enco=huffmanenco(double(x),dict);
The next code is the one I'm using:
fileID = fopen('reto2014.mid');
[x,cont]=fscanf(fileID,'%c');
fclose(fileID);
y=[1:256];
va = hist(double(x),y);
prob= va./cont;
bar(y,prob)
[dict,avglen]=huffmandict(y,prob);
enco=huffmanenco(double(x),dict);
I have tried to change the variable "y" but that doesn't work or it says me that The Maximum recursion limit of 500 have been reached what can I do to fix it?

Answer 1

You create a dictionary for the values 1 to 256, but your text has characters with larger number representations. Using the characters you posted, you find that the minimum is 32 and the maximum is 8364. You have to create a dictionary containing all possible characters:
y = double(unique(x));
This should give the desired results. You could also use
y = 1:65535;
which will probably give you exactly the same result, as for all characters which you don't have in your text x, the probability is 0.