[R] DateDiff

[David Winsemius]

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 i.e days between r(i+1) and r(i)

 > test$date1[2:length(test$date1)] - test$date1[1:(length(test 
$date1)-1)]
  [1] 1 1 1 1 1 1 1 1 1 1

 > test$diffdt <- c(NA, test$date1[2:length(test$date1)] - test 
$date1[1:(length(test$date1)-1)])

-- 
David.

>
> Any easy way to do this? (I've done it in a roundabout way but just
> wondering if there is any way more than done a loop)
>
> Thanks.
>
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