sorting english letter

[ill2000m]

I have written a M file which allows me to sort the frequencies with which each symbol appears in x,
from most frequent to least frequent... but i would like to sort frequecy of appearence of the english letter (a-z)inside x ...

e.g.
x =[A,A,B,C,]

so the result i want to get on the screen is 2A, 1B and 1C

does anyone know how to do it ..



%x is a data vector with nonnegative integer components
%F=frequency(x) is the vector whose components are the
%frequencies with which each symbol in appear in x
%from most frequent to least frequent
%
function F = frequency(x)



x =[1,2,3,3,4,4,4,5,5,5]

k=max(x)+1;
for i=1:k;
j=find(x==i-1);
u(i)=length(j);
end
r=find(u>0);
v=u(r);
v=sort(v);
m=length(v);
for i=1:m;
F(i)=v(m-i+1);
hist(x);
title('Frequency of each symbol appear on a text')
xlabel('s')
ylabel('a')
end

 

[xnuke]

Why do you want to do this?

xnuke

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[IRstuff]

So why can't you sort the letters the same way?

TTFN

 

[vorwald]

Use the unique command to sort the letters and find the unique values. Then use the find command to locate the letters. Then use the size command to get the number of letters. Then print the results

for example

x='zzzzjjccccdaaa'
ux=unique(x)
for iu=1:size(ux,2)
ifind=find(ux(iu)==x);
ic(iu)=size(ifind,2);
end

for iu=1:size(ux,2)
disp(sprintf('%c occurs %d times',ux(iu),ic(iu)));
end