R：扩展矩阵的第一列

Question

I generated this matrix with mat=matrix(c(1,2,3,4,5,6), nrow = 2, ncol = 2) and I got this result:

       [,1] [,2] [,3]
[1,]    1    3    5
[2,]    2    4    6

How can I add the second and third column to the first, like this:

         [,1] 
    [1,]    1   
    [2,]    2    
    [3,]    3    
    [4,]    4
    [5,]    5 
    [6,]    6

Is there any specific function that can solve this even If I would have 10 columns and I want them all added to the first column

Answer 1

我们可以只使用matrix包装，它返回一个单列对象

matrix(mat)