how can i compute probabalies in haffmaneco

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Yusuf lamah
Yusuf lamah el 7 de Feb. de 2020
Comentada: Walter Roberson el 10 de Feb. de 2020
how i can i compute probabalties to compress all letters small capital and numbers
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Yusuf lamah
Yusuf lamah el 8 de Feb. de 2020
how i can compute P in this dict = huffmandict(symbols,p); to compresss text contain letters capital, small and numbers
Walter Roberson
Walter Roberson el 8 de Feb. de 2020
You are right, my response of huffmandict() was not correct.

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Respuesta aceptada

Walter Roberson
Walter Roberson el 8 de Feb. de 2020
[unique_symbols, ~, bin_number] = unique(YourText(:));
symbol_counts = accumarray(bin_number, 1);
symbol_probs = symbol_counts ./ numel(YourText);
Alternately,
sparse_count = sparse(1, double(YourText(:)), 1);
[~, unique_symbols, symbol_counts] = find(sparse_count);
unique_symbols = char(unique_symbols.');
symbol_probs = symbol_counts.' ./ numel(YourText);
In both cases, after the code, unique_symbols will be a column vector of characters that exist in the text, and symbol_probs will be the corresponding probability.
The sparse() version has a minor flaw that it will fail if any characters in the text are binary 0.

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Yusuf lamah
Yusuf lamah el 8 de Feb. de 2020
thank you very much for your reply but i need to know how compute the probabaleties as input of dict
  2 comentarios
Walter Roberson
Walter Roberson el 10 de Feb. de 2020
Are you certain that this remark about needing to know how to compute the probabilities is the answer that you needed to your question? You Accepted it ?
Yusuf lamah
Yusuf lamah el 10 de Feb. de 2020
yes,thank you very much its working

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Yusuf lamah
Yusuf lamah el 8 de Feb. de 2020
this function to compute dict i need to compute probabelties

Yusuf lamah
Yusuf lamah el 10 de Feb. de 2020
how to hide text in an image using LSB technique
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Walter Roberson
Walter Roberson el 10 de Feb. de 2020
That is not a continuation of this question.
You should first use Google Scholar to research the topic.

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