how can i compute probabalies in haffmaneco

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Yusuf lamah
Yusuf lamah 2020-2-7
评论： Walter Roberson 2020-2-10
how i can i compute probabalties to compress all letters small capital and numbers
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Yusuf lamah
Yusuf lamah 2020-2-8
how i can compute P in this dict = huffmandict(symbols,p); to compresss text contain letters capital, small and numbers
Walter Roberson
Walter Roberson 2020-2-8
You are right, my response of huffmandict() was not correct.

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采纳的回答

Walter Roberson
Walter Roberson 2020-2-8
[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.

更多回答（3 个）

Yusuf lamah
Yusuf lamah 2020-2-8
thank you very much for your reply but i need to know how compute the probabaleties as input of dict
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Walter Roberson
Walter Roberson 2020-2-10
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 ?

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Yusuf lamah
Yusuf lamah 2020-2-8
this function to compute dict i need to compute probabelties
Yusuf lamah
Yusuf lamah 2020-2-10
how to hide text in an image using LSB technique
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Walter Roberson
Walter Roberson 2020-2-10
That is not a continuation of this question.
You should first use Google Scholar to research the topic.

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