[R] Dataframes and assign
Göran Broström
gb at stat.umu.se
Wed Oct 2 15:52:50 CEST 2002
I have the following function:
putsoc <- function(age, dat){
## age is an integer
## dat is a data.frame
new.name <- paste("soc", as.character(age), sep = ".")
if (new.name %in% names(dat)) stop(paste(new.name, "already in place"))
dat$new.var <- rep(1, nrow(dat)) ## Just nonsense.
n.var <- ncol(dat)
names(dat)[ncol(dat)] <- new.name
return(dat)
}
i.e., the function adds a new variable to a data frame. The problem is
that I only have the new variable name in a text string, and so would
like to use 'assign'. I have two questions:
1. Is my solution 'safe': Can I trust that the new variable always will be
the last one in the augmented data frame?
2. If I instead used 'assign(new.name, new.var)' how do I put the result
into the data frame?
---
Göran Broström tel: +46 90 786 5223
Department of Statistics fax: +46 90 786 6614
Umeå University http://www.stat.umu.se/egna/gb/
SE-90187 Umeå, Sweden e-mail: gb at stat.umu.se
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