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matlab写的lzw和huffman的编码

clc;
clear;
p=[0.1 0.2 0.3 0.4 ];
disp('abcd');
disp=(num2str(p));
strc='dcba';
[m n]=size(strc);
first=0;last=1;
for i=1:n
    letter=strc(i);
    value=last-first;
    switch(letter)
        case 'a'
        c1=first;
        c2=first+value*0.1;
        case 'b'
        c1=first+value*0.1;
        c2=first+value*0.3;
        case 'c'
        c1=first+value*0.3;
        c2=first+value*0.6; 
        case 'd'
        c1=first+value*0.6;
        c2=last;    
        otherwise
        errordlg('The input is fault','input error');
    end
    first=c1;last=c2;
end
[first last]