# How to create this monotonically increasing list of numbers?

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Dominik Mattioli on 11 Jul 2018
Answered: Michiele Ogbagabir on 11 Jul 2018
I want to use a vector V of length N
V = [1 1 2 1 2 3 1]
to create a monotonically increasing list L, where the values of L are as follows:
L = [1 2 3 3 4 5 5 6 6 6 7]
So the entries 1:N of V dictate how many times V(N) is listed sequentially in L,
i.e. the 1st entry in V is listed in L a total of V(1) times..., the nth entry of V is listed in L a total of V(n) times.
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### Accepted Answer

Paolo on 11 Jul 2018
Edited: Paolo on 11 Jul 2018
V = [1 1 2 1 2 3 1]
n = 1:numel(V);
L = repelem(n,V)
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### More Answers (1)

Michiele Ogbagabir on 11 Jul 2018
Here is one way
V = [ 1 1 2 1 2 3 1];
L = [];
for i = 1:length(V)
L = [L repelem(i, V(i))];
end
L
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