I have a vector of dimension d: (1,2,...,d) (it's (x_1,x_2,...,x_n) but I removed the 'x_' for simplicity). Now I would like to extend it (in a fast manner) to obtain a d*d vector of the form:
(1,1,...,1,2,...,2,...,d,d,...,d)
where each element repeat d times.
Thank you for your help.
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