Also, Instead of ?attach, you could try ?with or ?within aa$z<- with(aa,eval(parse(text=bb))) aa$z
#[1] 3 7 11 aa<- within(aa,z<- eval(parse(text=bb))) aa # x y z #1 2 3 3 #2 4 5 7 #3 6 7 11 A.K. ----- Original Message ----- From: arun <[email protected]> To: R help <[email protected]> Cc: Sent: Wednesday, September 25, 2013 8:47 AM Subject: Re: Re: Creating a new column to a data frame using a formula from another variable Hi, Change: aa$z<- eval(parse(text=bb)) aa # x y z #1 2 3 3 #2 4 5 7 #3 6 7 11 A.K. I want to create a new column to a data frame using a formula from another variable: Example: I have a data set "aa" is; x y 2 3 4 5 6 7 My R code is; >bb <- "x+y-2" >attach(aa) >aa$z<- bb >detach(aa) the result is; x y z 2 3 x+y-2 4 5 x+y-2 6 7 x+y-2 but I want like; x y z 2 3 3 4 5 7 6 7 11 Could you please help me.. ______________________________________________ [email protected] 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.
