huffman.m
function [h,l]=huffman(p)
if (length(find(p<0))~=0)
error('Not a prob,negative component');
end
if (abs(sum(p)-1)>10e-10)
error('Not a prob.vector,component do not add to 1')
end
n=length(p);
q=p;
m=zeros(n-1,n);
for i=1:n-1
[q,l]=sort(q);
m(i,:)=[l(1:n-i+1),zeros(1,i-1)];
q=[q(1)+q(2),q(3:n),1];
end
for i=1:n-1
c(i,:)=blanks(n*n);
end
c(n-1,n)='0';
c(n-1,2*n)='1';
for i=2:n-1
c(n-i,1:n-1)=c(n-i+1,n*(find(m(n-i+1,:)==1))...
-(n-2):n*(find(m(n-i+1,:)==1)));
c(n-i,n)='0';
c(n-i,n+1:2*n-1)=c(n-i,1:n-1);
c(n-i,2*n)='1';
for j=1:i-1
c(n-i,(j+1)*n+1:(j+2)*n)=c(n-i+1,...
n*(find(m(n-i+1,:)==j+1)-1)+1:n*find(m(n-i+1,:)==j+1));
end
end
for i=1:n
h(i,1:n)=c(1,n*(find(m(1,:)==i)-1)+1:find(m(1,:)==i)*n);
ll(i)=length(find(abs(h(i,:))~=32));
end
l=sum(p.*ll);
test.m
clear all,clc
p = [0.3 ,0.1, 0.21, 0.09, 0.05, 0.25];
[h,l] = huffman(p)
output：
h =
11
010
00
0111
0110
10
l =
2.3800
