From: bogdan romocea <br44114_at_gmail.com>

Date: Wed 26 Oct 2005 - 05:59:48 EST

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Wed Oct 26 06:05:37 2005

Date: Wed 26 Oct 2005 - 05:59:48 EST

Welcome to R. See

?merge

then

?aggregate

or

require(Hmisc)

?summarize

or

?by

You can probably find many examples in the archives, if needed.

*> -----Original Message-----
**> From: Michael Graber [mailto:michael_graber@gmx.de]
**> Sent: Tuesday, October 25, 2005 3:45 PM
**> To: R-Mailingliste
**> Subject: [R] data.frame-question
**>
**>
*

> Dear R-List,

*> I am very new to R and programming itself, so my question may
**> be easy to
**> answer for you.
**> I tried a lot and read through the manuals, but I still have the
**> following problem:
**> I have 2 data-frames:
**> Number<-as.numeric (Number)
**> Name<-as.character (Name)
**> TAB1<-data.frame (Name,Number)
**> - it looks like this:-
**> Name Number
**> A 2
**> A 3
**> A 6
**> B 8
**> B 12
**> B 7
**> C 8
**> D 90
**> E 12
**> E 45
**> …
**> Name_singular<-as.character (Name_singular)
**> TAB2<-data.frame (Name_singular)
**> # it looks like this:
**> Name_singular
**> A
**> B
**> C
**> D
**> E
**> -My result should be a data-frame, where the first column is
**> Name_singular and the second column should be the sum of the numbers
**> where Name ==Name_singular.-
**> For example:
**> TAB3:
**> Name_singular Sum
**> A 11
**> B 27
**> …
**> - I tried it with for-loops, but I think there must be an easier way.-
**> I would be very grateful for your help,
**>
**>
**> Michael Graber
**>
**> ______________________________________________
**> R-help@stat.math.ethz.ch mailing list
**> https://stat.ethz.ch/mailman/listinfo/r-help
**> PLEASE do read the posting guide!
**> http://www.R-project.org/posting-guide.html
**>
*

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Wed Oct 26 06:05:37 2005

*
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