David, Gabor, and Henriuqe,
Thanks a lot for help!
Another (inelegant) way is to use ts() and then supply the start and end
time. this inelegant way works (I guess at least for equally spaced data.) .

-Sean



On Tue, Sep 22, 2009 at 3:19 PM, David Winsemius <dwinsemius@comcast.net>wrote:

>
> On Sep 22, 2009, at 3:03 PM, Sean Zhang wrote:
>
> Dear R helpers.
>>
>> I am new to plotting time data using R.
>> wonder how to convert character time info into date in R.
>> I searched over the web but did not find answer.
>>
>> the input character string is something like 03_1993 or 03-1993, so the
>> precision is at month level.  I tried the following but failed.
>> #R code below.
>>
>> strptime(c("03_1993"),"%m_%Y")
>> strptime(c("03-1993"),"%m-%Y")
>>
>> Can you someone kindly show me to do it?
>>
>>
> The usual R classes do not have a year-month version but package zoo does:
>
> > library(zoo)
>
> > as.yearmon("03_1993","%m_%Y")
> [1] "Mar 1993"
>
>>
>> --
>
> David Winsemius, MD
> Heritage Laboratories
> West Hartford, CT
>
>

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