The dim() function outputs the number of rows followed by the number of columns of a given matrix.

> A = matrix(1:6, 2, 3)
> A
     [,1] [,2] [,3]
[1,]    1    3    5
[2,]    2    4    6
> dim(A)
[1] 2 3

Question

• Check the dimensions of the matrix B defined below: