How can I make a vector that looks like this [2 1 2 1 1 4 1 1 6 1 1 8...1 100 1]?

I am attempting to make a 151 element vector that starts out like [2 1 2 1 1 4...] so that between the 3n elements in the vector after the initial 3 values of 2, 1, 2 there are 2 ones followed by a term that is 2 more than the value of the 3rd element in the vector i.e (2 1 1 4 1 1 6 1 1 8 1 1 10 1 1... ) all the way to 1 1 100 1 as the last 4 elements in the vector.

cv4 = [2 1 2 ones(1,148)];

for i = 1:75

cv4(:,2*(i+1)) = 2;

end

cv4

This is the code i've used so far but it isn't anywhere near right.

cv4 = 1×152

This is the vector I have so far... [2 1 2 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2]

[John D'Errico]

Your question is too confusing. Is the vector of length 151? Or 152?

What are the fist elements? In two places, I have seen it start out as

2 1 1 4 1 1 6 1 1 8 1 1 10

Or maybe this

2 1 2 1 1 4 1 1 6 1 1 8

So what do you want to do? Can we answer a question that is not even consistent?

[Rowdy]

It starts out as 2 1 2 and then begins the repition of 2 1 1 4 1 1 6 and so on and so forth until the last 4 terms of the vector are 1 1 100 1. The lengrth of the vector is 151 elements it is just that my code is wrong. My apologies.

Answer 1

[William Rose]

@Rowdy

cv4=[2,1,2,ones(1,148)];
for i=6:3:151, cv4(i)=2*i/3; end
cv4

cv4 = 1×151

2 1 2 1 1 4 1 1 6 1 1 8 1 1 10 1 1 12 1 1 14 1 1 16 1 1 18 1 1 20

Try it.

[Rowdy]

Wow thank you for the insight! Thank you very much for the help! It worked and now I am able to implement this.

[William Rose]

@Rowdy, you're welcome.

Answer 2

[John D'Errico]

If I had to guess, you might want to do this:

V = ones(1,151);
V(1) = 2;
V(3:3:end) = 2:2:100;

V

V = 1×151

2 1 2 1 1 4 1 1 6 1 1 8 1 1 10 1 1 12 1 1 14 1 1 16 1 1 18 1 1 20

The last few elements of the vector are:

V(140:151)

ans = 1×12

1 94 1 1 96 1 1 98 1 1 100 1

But your question is far too confusing to know if that is what you want or not.

[Rowdy]

Great thank you for the help.