From: Michael Graber <michael_graber_at_gmx.de>

Date: Wed 26 Oct 2005 - 05:44:57 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 05:53:06 2005

Date: Wed 26 Oct 2005 - 05:44:57 EST

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 Received on Wed Oct 26 05:53:06 2005

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