embedded variable in R string

Question

I am trying to loop and rename colnames in a data frame.

How can I embed a numeric variable in the R's colname string. I found the .(x) associated to the bquote/paste method for title in graphics but it doesn't work with a standard string.

In Ruby I can embed a variable in a string using #{x} in the following way

irb(main):005:0> (1..10).each{|i| p "hello no #{i}"}
"hello no 1"
"hello no 2"
"hello no 3"
"hello no 4"
"hello no 5"
"hello no 6"
"hello no 7"
"hello no 8"
"hello no 9"
"hello no 10"

Thanks

paste? There is also sprintf but that's probably overkill. — joran
– joran, Commented Jun 6, 2012 at 11:51
Thanks, actually paste() works fine.I just messed up with .(x) instead of using a paste(name,num) — user17375
– user17375, Commented Jun 6, 2012 at 12:05
Both paste and sprintf are vectorized, so you might not even need the loop. — Greg Snow
– Greg Snow, Commented Jun 6, 2012 at 15:59

Itamar · Accepted Answer · 2012-06-06 12:28:35Z

1

You can simply use sprintf(). For example:

i <- 4;
data[[sprintf("hello.%1.2d",i)]] <- ...;

answered Jun 6, 2012 at 12:28

Itamar

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