How to Plot a histogram of the letter frequency from the encoding key? I can get my histogram to show me the ascii values of each letter that comes up but can't figure out how to get it to display the characters instead of ascii vals.

Question

Noah Hudson 2019-10-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/486015-how-to-plot-a-histogram-of-the-letter-frequency-from-the-encoding-key-i-can-get-my-histogram-to-sho

评论： Felipe Bachion de Santana 2021-3-15

function  Project2(symbols,Dictionary)
%probability vector goes in the dictionary
% symbols go in the transmitter
%tf = ischar(symbols)
%if tf == 1
    [dict,avglen] = huffmandict(num2cell(symbols), Dictionary);     %creates a 1x6 cell array for transmitter to create huffmandict
    sig = char( randsrc(1,10,[double(symbols); Dictionary]) );      %creates a signal from the probabilities of the Dictionary with random order
    encoded = huffmanenco(sig,dict)                                 %occurence of symbol is based on Dictionary
    decoded = cell2mat(huffmandeco(encoded,dict))
    z = isequal(sig,decoded)
%else
% [dict, avglen] = huffmandict(symbols,Dictionary);
% sig = randsrc(1,10,[symbols; Dictionary]);
% comp = huffmanenco(sig,dict);
% dsig = huffmandeco(comp,dict);
% isequal(sig,dsig);
% end
% the for loop below gives a binary key for each letter assigned
temp = dict;
for k = 1:length(temp)
  temp{k,2} = num2str(temp{k,2});
    
 
end
%Y = categorical(dict)
 G = double(decoded)      %this is histogram of ascii values
 histogram(G);
%histogram(Y);
dictionary.Symbols = symbols
dictionary.Probabilities = Dictionary
dictionary.averagelength = avglen
dictionary.encoded = encoded
dictionary.decoded = decoded
dictionary.Binarykey = temp
end
% function call Project2(['abcdef'],[.4,.15,.05,.15,.05,.2])

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Answer 1

Sid Singh 2019-10-21

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/486015-how-to-plot-a-histogram-of-the-letter-frequency-from-the-encoding-key-i-can-get-my-histogram-to-sho#answer_397422

编辑：Sid Singh 2019-10-21

在 MATLAB Online 中打开

Hi, it is expected if you use numeric values to plot the histogram. You can use categorical array to achieve what you want to do.

https://www.mathworks.com/help/matlab/ref/matlab.graphics.chart.primitive.histogram.html#buhzm_z-1-C

for k = 1:length(decoded)
    c_arr{k} = char(decoded(k));
end
categ_arr = categorical(c_arr);
%G = double(decoded);      %this is histogram of ascii values
histogram(categ_arr);