Lagged or leading vector/matrix
matrixtslag.Rd
Creates a lagged or leading vector/matrix of selected order(s).
Arguments
 k

an integer value, the number of positions the new series is to lag or to lead the input series.
 x
a numeric vector or matrix, missing values are allowed.
 trim

a logical flag, if TRUE, the missing values at the beginning ans/or end of the returned series will be trimmed. The default value is FALSE.