MATLAB: Indexing sections of arrays

arrayindexingMATLAB

Is there an easy way to extract every section's of n elements of a vector in MATLAB and skip the next n? Say we have
x = linspace(1,10,10); %[1 2 3 4 5 6 7 8 9 10]
I wish to index such that I grab 1,2,3 then skip 4,5,6 and again grab 7,8,9. For example,
a = zeros(1,10); % [0 0 0 0 0 0 0 0 0 0]
a(magic index) = x(magic index)
So now a = [1 2 3 0 0 0 7 8 9 0]
I've only been able to find how to get every nth element but not chunks of n elements.
Thank you for your help in advance !

Best Answer

x = 101:110
n = 3 
tf = mod(0:numel(x)-1, 2*n) < n
a = zeros(size(x)) 
a(tf) = x(tf)
index = find(tf)
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