[R] paste data

Hans-Joerg Bibiko bibiko at eva.mpg.de
Wed Jun 18 11:01:32 CEST 2008

On 18 Jun 2008, at 10:36, Sybille Wendel wrote:
> I need a command.
> I have a lot of data in different dataframes(auto.0a, auto.0b, auto. 
> 0c, auto.5Na,...), that has similar names.
> I could print the names all at once wih a loop with the command  
> paste(), see below:
> plot<- 
> c("0a","0b","0c","5Na","5Nb","5Nc","PKa","PKb","PKc","5NPKa","5NPKb",
> 	"5NPKc","10NPKa","10NPKb","10NPKc","20NPKa","20NPKb","20NPKc")
> for (x in 1:length(plot))
> {
> 	name<-paste("auto.",plot[x],sep="")
> 	print(name)
> }

First of all, maybe it is better to avoid to name a variable 'plot'.  
It works, but it could be a bit confusing.

You can do this easier (paste can handle vectors etc.):
name<-paste("auto.", plot, sep="")

> I want to do very similar things with all the dataframes and their  
> structure is also the same.
> Is there a way to write a loop? (so that I don't have to write the  
> same 18 times)
> I tried things like that:
> for (x in 1:length(plot))
> {
> 	plot(paste("auto.",plot[x],sep="")[,1],paste("auto.",plot[x],sep="") 
> [,2],col=...)
> }

paste("auto.",plot[x],sep="")[,1]  => doesn't work.

Assuming that 'auto.0a' is a data.frame you should use


instead to get the first column of the data.frame 'auto.0a'

Maybe try:

get(paste("auto.",plot[x],sep=""))[,2], col=...)


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