如何连接两个向量（按列）

Question

I use the code below to concatenate two vectors in a same matrix:

tab variable if variable <= number, matcell(x)
matrix list x   
mat a = x
mat a = a\x

However, Stata concatenates in a same column with this code.

I need to concatenate it in two vectors in a same matrix making a nx2 matrix.

Answer 1

You need to use , instead of \\ :

sysuse auto, clear
tabulate foreign, matcell(x)

matrix list x

x[2,1]
    c1
r1  52
r2  22

matrix a = x
matrix a = a , x

matrix list a

a[2,2]
    c1  c1
r1  52  52
r2  22  22