What's the best way to create a vector with a repeating and diminutive sequence?
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For a small example, how to create a version of this, with a longer seequence. These are integers of equal length apart:
v = 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 1 2 ....
and the starting sequence length will be scaled up into the 100s or 1000s.
Any thoughts?
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Accepted Answer
Matt Fig
on 3 Jun 2011
N = 6;
A = cumsum(tril(ones(N,'single')));
A = A(A>0).';
If memory is a concern, this will conserve it:
L = (N^2+N)/2;
B = ones(1,L);
idx = (1:N).*((1:N)-1)/2;
Li = length(idx);
B(idx(2:Li)) = -(1:Li-1);
B = cumsum(B(L:-1:1));
2 Comments
Matt Fig
on 3 Jun 2011
In that case, just reverse the order of two operations:
A = tril(cumsum(ones(N,'single')));
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