How to use loop in my code for key generation

Hi. i want to generate 16 sub keys .Algorithm is as follows

K=[k1, k2, k3, k4]%initial key and are points on elliptic curve.

for first key,

k5=2*k4+k1

k6=k5+k2

k7=k6+k3

k8=k7+k4

K1=dec2bin[k5 k6 k7 k8]

similarly i have to generate 16 subkeys. Multiplication and addition is of elliptic curve addition and multiplication.

a=0;
b=17;
n=313;
A=[[36 6]; [117 3] ;[198 310] ;[68 86]];
k=size(A,1);
B=zeros(size(A))
    temp=A(k,:)
    A4=multell(temp,2,a,b,n);
    A5=addell(A4,A(k-3,:),a,b,n);
    A6=addell(A5,A(k-2,:),a,b,n);
    A7=addell(A6,A(k-1,:),a,b,n);
    %temp(A(k+1),:)
B=[A4 A5 A6 A7];
B1=dec2bin(B)
key1=reshape(B1,1,64)

Answer 1

[KALYAN ACHARJYA]

#Edited

k=cell(1,8);
k{1}=[36 6];
k{2}=[117 3];
k{3}=[198 310];
k{4}=[68 86];
for i=5:8
k{i}=2*k{i-1}+k{i-4};
end

[sadiqa ilyas]

k1=[36 6] k2= [117 3] k3=[198 310] k4=[68 86]

All these are elments of matrix A

[KALYAN ACHARJYA]

k=cell(1,8);
k{1}=[36 6];
k{2}=[117 3];
k{3}=[198 310];
k{4}=[68 86];
for i=5:8
k{i}=2*k{i-1}+k{i-4};
end
K1=cell(1,4);
for i=1:4
    K1{i}=dec2bin(k{i+4});
end
K1

#if you can avoid loops, it may recomended.

[sadiqa ilyas]

thanks it works

[KALYAN ACHARJYA]

Welcome @Sadiqa