r - Creating a "Lagged" Data Frame -


i have following data frame , want shift first 2 columns down. basically, want see 'lagged' data frame. there seems lot on how single column (see here), nothing select of columns.

my data =  d1 <- data.frame(month = c("jan", "feb", "mar", "apr", "may", "june"),                 conv =  c(1, 3, 6, 2, 3, 8),                 month = c("jan", "feb", "mar", "apr", "may", "june"),                 visit =  c( 1,  2,  4,  8, 16, 32),                 click =  c(64, 62, 36,  5,  6,  3)) d1  desired output =  d2 <- data.frame(month = c("jan", "feb", "mar", "apr", "may", "june"),                 conv =  c(1, 3, 6, 2, 3, 8),                 month = c(na, "jan", "feb", "mar", "apr", "may"),                 visit =  c( na, 1,  2,  4,  8, 16),                 click =  c(na, 64, 62, 36,  5,  6)) d2

help?!

a cheap method:

cbind(d1[,1:2],head(rbind(na,d1),-1)[,-(1:2)])

result:

  month conv month.1 visit click 1   jan    1    <na>    na    na 2   feb    3     jan     1    64 3   mar    6     feb     2    62 4   apr    2     mar     4    36 5   may    3     apr     8     5 6  june    8     may    16     6

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