trying to iterate through a vector changing the value of 1/5 in each iteration ?

Im trying to do calculations with x with different b, so for example the first calculation is with b = 1/5 0 0 0 0 0 0 0 ....
then the next calculation with x will be with 1/5 now being in second index like b = 0 1/5 0 0 0 0 0 ......
till the last calculation b = 0 0 0 0 0 0.......1/5.

b = zeros(size(A,1),1);
>> b(1) = 1/5;
>> for i=1:size(A,1);
x = A\b;
b(i+1) = b(i);
b(i-1) = 0;
end

Answer 1

[Stephen23]

N = size(A,1);
for k = 1:N
    b = zeros(1,N);
    b(k) = 1/5;
    x = A\b;
end

[Jos (10584)]

N = size(A,1);
b = zeros(1,N);
for k = 1:N
    b(k) = 1/5;
    x = A\b;
    b(k) = 0 ;
end