This must be easy to do.....

I have a vector and a lookup data.frame:

> v
[1] "5" "234" "234" "42-43" "234" "42-43" "234" "234" "42-43" "234" "5" "234" "234" "5" "234" "234" "5" "234" "234"
> df
  id  Name
1         5 12-13
2         2   234
3         4 42-43
4         1     5

How can I simply substitute the values in vector v with the corresponding id value from lookup table df? I'd expect the following output:
> v
[1] "1" "2" "2" "4" "2" "4" "2" "2" "4" "2" "1" "2" "2" "1" "2" "2" "1" "2" "2"

Cheers,
Nathan

--
--------------------------------------------------------
Dr. Nathan S. Watson-Haigh
OCE Post Doctoral Fellow
CSIRO Livestock Industries
University Drive
Townsville, QLD 4810
Australia

Tel: +61 (0)7 4753 8548
Fax: +61 (0)7 4753 8600
Web: http://www.csiro.au/people/Nathan.Watson-Haigh.html

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