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Extracting every nth and (n+1)th element

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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

Accepted Answer

Cris LaPierre
Cris LaPierre on 6 Dec 2020
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

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