Extracting every nth and (n+1)th element

Hi,

I have A = (1:101). How can I extract every nth and (n+1)th element?

For example, if n = 10, I want reate B = [10, 11, 20, 21, ...100, 101].

I know how to extract every nth element using: A(1:n:end).

Any help would be appreciated! Thank you.

Inna

Answer 1

[Cris LaPierre]

I'm not aware of any slick way to do this. I'd combine two arrays, one from 10:10:101, and one from 11:10:101.

n=10;
A = (1:101);
ind = sort([n:n:101 n+1:n:101]);

A(ind)

ans = 1×20

10 11 20 21 30 31 40 41 50 51 60 61 70 71 80 81 90 91 100 101

[Inna Pelloso]

Thank you!