[R] unique-fy colume names

[Prof Brian Ripley]

See ?make.unique

On Mon, 16 Jun 2008, Daren Tan wrote:

>
>
> I have a column containing duplicate entries and need to append numeric suffixes to make them unique. How ?
>
> e.g., paste("id", c(1:10,1,5,10,10), sep=".")
> [1] "id.1"  "id.2"  "id.3"  "id.4"  "id.5"  "id.6"  "id.7"  "id.8"  "id.9"[10] "id.10" "id.1"  "id.5"  "id.10" "id.10"
> I hope to get
> [1] "id.1"  "id.2"  "id.3"  "id.4"  "id.5"  "id.6"  "id.7"  "id.8"  "id.9"[10] "id.10" "id.1.1"  "id.5.1"  "id.10.1" "id.10.2"
>
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595