How can I add on to y in a for loop? Insert zeros into vector. cody question

The code returns 5 0 0.

I used the debugger. The for loop made 1 0 0; 2 0 0;....; 5 0 0

The goal is to return y = [1 0 0 2 0 0 3 0 0 4 0 0 5 0 0]

x = [1 2 3 4 5];
n = 2;
% zero = zeros(1,n)
% [x(1) 0 0 x(2) 0 0]
y = [];
zero=zeros(1,n);
% How can I combine y?
for i = 1:1:length(x)
    y = [x(i),zero]
end

[Walter Roberson]

You are overwriting all of y in each iteration of your "for" loop.

Answer 1

[Jan]

A hint:

y = [1,2,3]

Then how do you create this output:

[1,2,3,6,7,8]

? Do you see it? You need to include the former value of y.

Another idea:

Create the vector of zeros at first, which has (n+1)*length(x) elements. Then use this as index:

1 + (0:length(x)-1)) * (n + 1)

or equivalently (find out, why this creates the same result!)

1:(n+1):length(y)

when y is the created vector of zeros.

[A C]

It works when I added y. When you put y there, it stores every cycle? y = [y,x(i),zero];