[R] Welcome to the "R-help" mailing list

Ista Zahn izahn at psych.rochester.edu
Wed Dec 1 03:59:50 CET 2010

Hi Bill,
You might be working too hard. Consider:
> weekdays(as.Date('2010-11-30')) == "Monday"
> weekdays(as.Date('2010-11-29')) == "Monday"
[1] TRUE


On Tue, Nov 30, 2010 at 9:40 PM, Bill Yang <gy631223 at hotmail.com> wrote:
> Hi there,
> I am having problem of matching string. what i want is when i type a date such as 2010-11-30, the function will return the day (monday, tuesday, wednesday, thursday, friday or staturday). then i want another function will return true if the return of the day is monday, return false if the return of the day is not monday.
> I already find the weekdays(as.Date('2010-11-30')) function which will tell me exactly what day its gonna be. however, i am having problem of return True or False whether or not the return day has matched.
> please help me out. I appreciate.
> Bill
> P.S the following is the partial codes.if(match(weekdays(as.Date('2010-11-30'), "Monday")==1){print("yes")}
> r-help at r-project.org
>> Subject: Welcome to the "R-help" mailing list
>> From: r-help-request at r-project.org
>> To: gy631223 at hotmail.com
>> Date: Wed, 1 Dec 2010 03:34:01 +0100
>> Welcome to the R-help at r-project.org mailing list!
>> To post to this list, send your email to:
>>   r-help at r-project.org
>> General information about the mailing list is at:
>>   https://stat.ethz.ch/mailman/listinfo/r-help
>> If you ever want to unsubscribe or change your options (eg, switch to
>> or from digest mode, change your password, etc.), visit your
>> subscription page at:
>>   https://stat.ethz.ch/mailman/options/r-help/gy631223%40hotmail.com
>> You can also make such adjustments via email by sending a message to:
>>   R-help-request at r-project.org
>> with the word `help' in the subject or body (don't include the
>> quotes), and you will get back a message with instructions.
>> You must know your password to change your options (including changing
>> the password, itself) or to unsubscribe.  It is:
>>   8711208752
>> Normally, Mailman will remind you of your r-project.org mailing list
>> passwords once every month, although you can disable this if you
>> prefer.  This reminder will also include instructions on how to
>> unsubscribe or change your account options.  There is also a button on
>> your options page that will email your current password to you.
>        [[alternative HTML version deleted]]
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

Ista Zahn
Graduate student
University of Rochester
Department of Clinical and Social Psychology

More information about the R-help mailing list