repeat an element in a vector

2020 3 27
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更新时间：2020 3 27
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Hi all,
I have one vector and i wish to repeat the first element of the vector once at the very beginning.
For example:
n = [1 2 3 4 5 6 7 8 9]
to
n = [1 1 2 3 4 5 6 7 8 9]
Thank you all.

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