Pie chart with a limited number of slices

Hi!

I need to add a pie chart to the code below which only shows the ten most occurring letters in a text. Please help me to get this right.

fid=fopen('krypterad1.txt','rt');
text = fscanf(fid,'%c',Inf);
text = upper(text);
nummer = double(text);
sorterad = sort(text, 'descend')
pie(sorterad)
n = histc(nummer, 65:90);
for n =65:90;
    for antal=1:n;

    end
end
f = input('byt från ','s')
t = input('till ','s')
diff = double(t) - double(f)
for rulla = nummer+(diff)
    if rulla<=64, rulla=rulla+26; end

    if rulla>90, rulla=rulla-26; end
    okodadtext = char(rulla);
    fprintf('%s', okodadtext);
end

Thank you!

Best Regards/Henrik

Answer 1

[Charu]

Hello Henrik,

According to my understanding you are trying to create a pie chart displaying the top 10 most frequent characters from your dataset, it's important to sort the characters based on their frequencies. In the code you provided, the histc function was used to calculate these frequencies. However, it is worth noting that histc is an older function and its use is now discouraged. For the R2024b version, it is recommended to use the histcounts function, which offers enhanced functionality and is more up-to-date.

Below is a code snippet demonstrating how to achieve this using histcounts:

% Calculate the histogram of letter frequencies (A-Z)
frequencies = histcounts(nummer, 64.5:1:90.5);

In this example, histcounts is employed to compute the frequency of each letter from 'A' to 'Z'. The function achieves this by specifying the ASCII range from 65 to 90, ensuring accurate frequency calculation.

For further details on the histcounts function, you can refer to the official documentation:

https://www.mathworks.com/help/releases/R2024b/matlab/ref/double.histcounts.html

Additionally, for more information on why the use of histc is discouraged, you may consult the relevant documentation, you can refer to this part of the documentation.

https://www.mathworks.com/help/releases/R2024b/matlab/creating_plots/replace-discouraged-instances-of-hist-and-histc.html

Hope this is beneficial!