lag function in data.tables in R

Asked Dec 20 '13 at 08:13

Active Dec 20 '13 at 08:13

Viewed 88 times

Given below is my dataset. I am using lag function to shift rows by 1 and 2 numbers.But it is not doing it Dataset

structure(list(var_1 = 1:10, var_2 = c(0, 1, 0, 0, 0, 0, 0, 0, 
0, 0), var_3 = c(0, 0, 1, 0, 0, 0, 0, 0, 0, 0)), .Names = c("var_1", 
"var_2", "var_3"), row.names = c(NA, -10L), class = c("data.table", 
"data.frame"), .internal.selfref = <pointer: 0x0000000000320788>)

Command used for lagging

dat[,lagged:=lag(var_1,-1,na.pad=TRUE)]

I was using the solution given on the below link Basic lag in R vector/dataframe

edited May 23 '17 at 10:25

Community

asked Dec 20 '13 at 08:13

user2786962

Do you want `dat[, lagged := c(NA, head(var_1, -1))]`? – Roland Dec 20 '13 at 08:24
Sounds like a duplicated of this one. http://stackoverflow.com/a/11448652/176995 – Tommy O'Dell Dec 20 '13 at 08:36

lag function in data.tables in R

0 Answers0