Hello list, I'd like to use a variable (or a column of a data frame) by using its name as a string. E.g.: Data2003 <- c(150,200,120) Data2004 <- c(145,211,110) myvar1 <- "Data2003" myvar2 <- "Data2004" # now I'd like do do this total <- Data2003 + Data2004 # in any way like # total <- ???(myvar1, myvar2) # or # total <- ???(myvar1) + ???(myvar2) # or something like that Is there a possibility to do this in R - can't find a solution! Thanks a lot
look at ?get, this is also in R-FAQ 7.21
get(myvar1) + get(myvar2)
Best,
Dimitris
----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven
Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/16/396887
Fax: +32/16/337015
Web: http://www.med.kuleuven.ac.be/biostat/
http://www.student.kuleuven.ac.be/~m0390867/dimitris.htm
----- Original Message -----
From: "Oskar Villani" <o.villani at utanet.at>
To: <r-help at stat.math.ethz.ch>
Sent: Thursday, November 04, 2004 2:58 PM
Subject: [R] calling a var by name in another var
> Hello list,
>
> I'd like to use a variable (or a column of a data frame) by using
> its name as a
> string. E.g.:
>
> Data2003 <- c(150,200,120)
> Data2004 <- c(145,211,110)
>
> myvar1 <- "Data2003"
> myvar2 <- "Data2004"
>
> # now I'd like do do this
>
> total <- Data2003 + Data2004
>
> # in any way like
> # total <- ???(myvar1, myvar2)
> # or
> # total <- ???(myvar1) + ???(myvar2)
> # or something like that
>
> Is there a possibility to do this in R - can't find a solution!
>
> Thanks a lot
>
> ______________________________________________
> R-help at 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
>
On Thu, 4 Nov 2004, Oskar Villani wrote:> Hello list, > > I'd like to use a variable (or a column of a data frame) by using its name as a > string. E.g.: > > Data2003 <- c(150,200,120) > Data2004 <- c(145,211,110) > > myvar1 <- "Data2003" > myvar2 <- "Data2004" > > # now I'd like do do this > > total <- Data2003 + Data2004 > > # in any way like > # total <- ???(myvar1, myvar2) > # or > # total <- ???(myvar1) + ???(myvar2) > # or something like that >A) This is a FAQ B) Many people who think they want to do this would be better off putting the variables into a list. -thomas
get(myvar1) + get(myvar2) [1] 295 411 230 On Thu, 2004-11-04 at 13:58, Oskar Villani wrote:> Hello list, > > I'd like to use a variable (or a column of a data frame) by using its name as a > string. E.g.: > > Data2003 <- c(150,200,120) > Data2004 <- c(145,211,110) > > myvar1 <- "Data2003" > myvar2 <- "Data2004" > > # now I'd like do do this > > total <- Data2003 + Data2004 > > # in any way like > # total <- ???(myvar1, myvar2) > # or > # total <- ???(myvar1) + ???(myvar2) > # or something like that > > Is there a possibility to do this in R - can't find a solution! > > Thanks a lot > > ______________________________________________ > R-help at 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 >