how can i compute probabalies in haffmaneco

how i can i compute probabalties to compress all letters small capital and numbers

[Walter Roberson]

With huffmandict()

[Yusuf lamah]

how i can compute P in this dict = huffmandict(symbols,p); to compresss text contain letters capital, small and numbers

[Walter Roberson]

You are right, my response of huffmandict() was not correct.

Answer 1

[Walter Roberson]

[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.

[Yusuf lamah]

thank you very much for your help

Answer 2

[Yusuf lamah]

thank you very much for your reply but i need to know how compute the probabaleties as input of dict

[Walter Roberson]

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]

yes,thank you very much its working

Answer 3

[Yusuf lamah]

this function to compute dict i need to compute probabelties

Answer 4

[Yusuf lamah]

how to hide text in an image using LSB technique

[Walter Roberson]

That is not a continuation of this question.

You should first use Google Scholar to research the topic.