How to repeat first column and join to another column?

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

Answer 1

[DGM]

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)']

[Kris Sarikanoppakhun]

Thank you so much buddy