These two examples mentioned are not well understood. Examples of the corresponding operation
SEQ [extracting the number of rows, the number of lines extracted several elements, from which extraction matrix], it represents all of the default
E.g
seq[2,3,1]
From the first matrix, the second element of the third row of extraction result 8
Wherein each parameter allows the number of columns in the form of e.g.
> seq[1:2,1,1]
[1] 1 2
Representative, a first matrix (a matrix with the same number of columns, so column matrix should be) the first row element 1-2
> seq[1:2,1,1:2]
[,1] [,2]
[1,] 1 13
[2,] 2 14