R help - Sep 2006 - printing a variable name in a for loop

Hello,

How do you print a variable name in a for loop?

I'm trying to construct a csv file that looks like this:


	Hello, variable1, value_of_variable1, World,
	Hello, variable2, value_of_variable2, World,
	Hello, variable3, value_of_variable3, World,


Using this:

	for (variable in list(variable1, variable2, variable3)){

		cat("Hello,", ???variable???, variable, ", World,")
	}

This works fine if I'm trying to print the VALUE of variable, but I want to
print the NAME of variable as well.

Thanks,
Suzi

This would do it:
> v1 <- 5
> v2 <- 6
> v3 <- 7
> vns <- paste("v",1:3,sep="")
> for (i in 1:length(vns)) cat("Hello", vns[i], get(vns[i]),
"World\n", sep=",")
Hello,v1,5,World
Hello,v2,6,World
Hello,v3,7,World


On 24/09/06, Suzi Fei <feis at ohsu.edu> wrote:
> Hello,
>
> How do you print a variable name in a for loop?
>
> I'm trying to construct a csv file that looks like this:
>
>
>         Hello, variable1, value_of_variable1, World,
>         Hello, variable2, value_of_variable2, World,
>         Hello, variable3, value_of_variable3, World,
>
>
> Using this:
>
>         for (variable in list(variable1, variable2, variable3)){
>
>                 cat("Hello,", ???variable???, variable, ",
World,")
>         }
>
> This works fine if I'm trying to print the VALUE of variable, but I
want to
> print the NAME of variable as well.
>
> Thanks,
> Suzi
>
> ______________________________________________
> 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
> and provide commented, minimal, self-contained, reproducible code.
>

-- 
================================David Barron
Said Business School
University of Oxford
Park End Street
Oxford OX1 1HP

Suzi Fei wrote:
> Hello,
> 
> How do you print a variable name in a for loop?
> 
> I'm trying to construct a csv file that looks like this:
> 
> 
> 	Hello, variable1, value_of_variable1, World,
> 	Hello, variable2, value_of_variable2, World,
> 	Hello, variable3, value_of_variable3, World,
> 
> 
> Using this:
> 
> 	for (variable in list(variable1, variable2, variable3)){
> 
> 		cat("Hello,", ???variable???, variable, ", World,")
> 	}
> 
> This works fine if I'm trying to print the VALUE of variable, but I
want to
> print the NAME of variable as well.
> 
This is a teetering heap of assumptions, but is this what you wanted?

Suzi<-1
HiYa<-function(x) {
  cat("Hello",deparse(substitute(x)),x,"World\n",sep=",
")
}
HiYa(Suzi)

Jim