Coding Matlab

clear all
clc
asli=['ABCDE FGHIJKLMNOPQRSTUVWXYZ'];
kata=upper(input('Masukkan Teks :','s'));
putar=input('Kunci :');
ce=[];
m=[];
de=[];

pj=size(kata,2);
x=0;

for i=1:pj;
   
    m=[m kata(i)];
    ce=[ce find(asli(:,:)==kata(i))];
    de=[ce find(asli(:,:)==kata(i))];
    x=mod((ce+putar),27);
    s=ce;
    st=asli(:,x);
end
awal=s
ciper=x
chipertext=st
plot(x)
grid on