How to repeat first column and join to another column?

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Kris Sarikanoppakhun
评论： Kris Sarikanoppakhun 2021-3-28
Hello everyone , i'm newbie that need some help
I want to know how to write from [1 2 3 4 22 23 24 43 44 45 64 65] to be
1 2
1 3
1 4
1 22
1 23
1 24
1 43
1 44
1 45
1 64
1 65

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回答（1 个）

DGM
DGM 2021-3-27
Here's one approach:
% given a row vector
a=[1 2 3 4 22 23 24 43 44 45 64 65];
B=[repmat(a(1),[length(a)-1 1]) a(2:end)']

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