title: Huffman dictionary does not have the codes for all the input signals
body: <p>I seem to be having a problem passing the string and dictionary through the <code>huffmanenco</code> function. I've tried almost everything, but the I keep getting the error that the Huffman dictionary does not have all the input codes. Yet I'm positive it does.</p>
  
  <pre><code>%% HUFFMAN TEST
  clear all; close all; clc;
  
  
  sig = ['a'; 'b'; 'c'; 'd'; 'e'; 'f'; 'g'; 'h'; 'i'; 'j';...
              'k'; 'l'; 'm'; 'n'; 'o'; 'p'; 'q'; 'r'; 's'; 't';...
              'u'; 'v'; 'w'; 'x'; 'y'; 'z'; ':'; ' '; ','; '.'];
  
  
  
  % Get probability
  char_count = zeros(30,1);
  
  for i = 1:30
      for c = sig(i)
          char_count(i,1) = length(find(sig == c));
      end
  end
  
  sym_prob = char_count / sum(char_count);
  
  
  % Huffman Dictionary
  % symbols = cellstr(symbols); % Still doesn't work in huffmandict, so try manually typing out again with curly braces
  sig = {'a'; 'b'; 'c'; 'd'; 'e'; 'f'; 'g'; 'h'; 'i'; 'j';...
              'k'; 'l'; 'm'; 'n'; 'o'; 'p'; 'q'; 'r'; 's'; 't';...
              'u'; 'v'; 'w'; 'x'; 'y'; 'z'; ':'; ' '; ','; '.'};
  
  [dict, aveLength] = huffmandict(sig, sym_prob);
  
  
  % Process signal
  str = 'A technique is developed to construct a representation of planar objects undergoing a general affine transformation. The representation can be used to describe planar or nearly planar objects in a three-dimensional space, observed by a camera under arbitrary orientations.';
  str_int = bin2dec(dec2bin(str));
  
  sig = cell(size(str));
  for i = 1:length(str)
      sig{i} = char(str_int(i));
  end
  
  
  % Encode &amp; Decode
  sig_enco = huffmanenco(sig, dict);
  dsig = huffmandeco(sig_enco, dict);
  </code></pre>