Command Reference : Matrix Language Reference
Syntax: @lag(m,l)
Argument 1: matrix, m
Argument 2: integer, l
Return: matrix
Create a matrix of the same size as m, with rows shifted down (or up if l is negative) l places. Unavailable rows will be filled with NAs.
matrix(5,4) a
matrix b = @lag(a,2)
Matrix a will be a 5x4 matrix containing random numbers. Matrix b will have two rows of NAs, followed by the first through third rows of a.