How to implement the Linear Block Codes ?

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Hello,

I have a voice signal which I have quantized and applied Huffman encoding and now I need to implement the Linear block codes. After the huffman encoding I have the index values as a 40000x1 double matrix (which needs to be coded) and this is the code that I use:

symbols = [1:17]; % Distinct symbols that data source can produce
p = prob_y; % Probability distribution
[dict,avglen] = huffmandict(symbols,p); % Create dictionary.
comp = huffmanenco(index,dict);
code = encode(index,n,k,'linear/decimal',genmat); %Linear Block codes

Here I don't really know which values to choose for n and k to calculate genmat(generator matrix).My index matrix has the dimensions of 40000x1 double. I would be glad if you could help on that. Thanks!