[R] [ExternalEmail] Bulk Match/Replace

[Bill.Venables at csiro.au]

> (id <- with(df, id[match(v,Name)]))
 [1] 1 2 2 4 2 4 2 2 4 2 1 2 2 1 2 2 1 2 2

________________________________________
From: r-help-bounces at r-project.org [r-help-bounces at r-project.org] On Behalf Of Nathan S. Watson-Haigh [nathan.watson-haigh at csiro.au]
Sent: 27 January 2010 10:31
To: r-help at r-project.org
Subject: [ExternalEmail] [R] Bulk Match/Replace

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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