Jim and Chuck,

Thanks a lot for your replies :)
I knew that there was a better way than the complex thing I was planning to apply :p (with a lot of for/while/apply arghhh)
I also remembered to use factor when my brain woke up ;)

I did something like unclass(factor(c("ab","ab","bb","cat","cat","ab"))) which is also doing the right job.
Thx a lot for your fast replies.

Naira

Jim Lemon wrote:
Naira wrote:
Dear all,

I would like to know if there is an easy to transform a vector of strings to
a vector of integers.
Ex: ("ab","ab","bb","cat","cat","ab") will be
(1, 1, 2, 3, 3, 1)

Hi Naira,
It's not all that hard...

newfactor<-as.factor(c("ab","ab","bb","cat","cat","ab"))
 newfactor
[1] ab  ab  bb  cat cat ab
Levels: ab bb cat
as.numeric(newfactor)
[1] 1 1 2 3 3 1

Jim


--
==================================================================
Naira Naouar
Tel:+32 (0)9 331 38 63
VIB Department of Plant Systems Biology, Ghent University
Technologiepark 927, 9052 Gent, BELGIUM
[EMAIL PROTECTED]                         http://www.psb.ugent.be

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