[R] How to use macro variable in a text string

[David Winsemius]

On Jul 22, 2009, at 5:46 PM, kxk wrote:

>
> I want to use read.table to input many files, each for a different  
> year.  I
> would like to use the macro variable 't' to refer to the exact file  
> that I
> would like to input the data using read.table.  How could I do  
> this?  Thank
> you!
>
> for (t in 1970:2005)
> { edge <- read.table(file="edge_t.csv", header=T,  sep=",")

Pretty sure that will not work. Take a look at the paste function for  
putting together strings and values.

paste("test", 1:3, sep="")

#[1] "test1" "test2" "test3"

And you might consider whether you want "edge" to be wiped out the  
next time through the loop, too. That is what would happen with your  
current construction.


> ## I will  have many rows of code following the read.table line
> }
>
> --

David Winsemius, MD
Heritage Laboratories
West Hartford, CT