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