[R] Month end calculations

[Jim Porzak]

Hi Shubha,


By using the tautology that the end of a month is immediately followed
by the first of a month, the following returns a TRUE when the date is
the last day of a month

IsMonthEnd <- format(MyDates + 1, "%d") == "01"

where MyDates is a vector, or column in a data frame, typed as Date
(eg with as.Date)

-- 
HTH,
Jim Porzak
Responsys, Inc.
San Francisco, CA
http://www.linkedin.com/in/jimporzak

On 8/29/07, Shubha Vishwanath Karanth <shubhak at ambaresearch.com> wrote:
> Hi R users,
>
>
>
> Is there a function in R, which does some calculation only for the month
> end in a daily data?... In other words, is there a command in R,
> equivalent to "last." function in SAS?
>
>
>
> BR, Shubha
>
>
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