[R] A function slightly different from diff()

dimitrijoe@ipea.gov.br dimitrijoe at ipea.gov.br
Thu Jan 26 02:24:14 CET 2006


I wonder if the following function has already been implemented in (some) R

                summ <- function(x, lag=1) # x is a vector
                            n <- length(x)
                            x[(1+lag):n] + x[1:(n-lag)]

which (I think) the only difference from diff() is "+" instead of "-", for

Thank you,
Dimitri Szerman

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