Hi every one,
I have a simple question. I want to make a vector from one of  the colomns in a data set. for example I have this data:
x1 x2 x3
1   5   7
4   8   9
8    6  12
4   8   13
 I want to convert x1 to a vector such as:
x1= c(1,4,8,4)
How I can do it?
Thanks
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