Hi:
Here's a toy example:
dat <- seq(as.Date('1990/05/01'), to = as.Date('1990/12/01'), by = 'week')
ddf <- data.frame(datBegin = dat[-length(dat)], datEnd = dat[-1])
ddf <- transform(ddf, datDiff = datEnd - datBegin)
Alternatively, if you don't want the data frame route,
datDiff <- diff(dat)
l
On Oct 6, 2010, at 11:07 PM, Santosh Srinivas wrote:
Dear List,
I have a column of dates say:
test$date1 <- seq(19900511, to = 19900521)
Those aren't dates. (but if they were the methods should be the same)
I want the next column to have the number of days between each
subsequent
date
Dear List,
I have a column of dates say:
test$date1 <- seq(19900511, to = 19900521)
I want the next column to have the number of days between each subsequent
date i.e days between r(i+1) and r(i)
Any easy way to do this? (I've done it in a roundabout way but just
wondering if there is any way m
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