Dear all,

I have got a question for generating repeats of a vector's elements.
Please don't hesitate to email me back and say that it is very easy
although I can't find a method to solve it.

If I have a n-vector b, whose elements are b[1], b[2], ..., b[n], how
can I generate such a vector

  b[1],   b[1], b[2],   b[1], b[2], b[3],   b[1], b[2], b[3], b[4],
......,   b[1], b[2], ..., b[n]

which contains n(n+1)/2 elements.

Thanks very much.

Regards
Chaofeng Kou

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