[R] Conversion of column matrix into a vector without duplicates

[ONKELINX, Thierry]

?unique

unique(A[, 2])

------------------------------------------------------------------------
----

ir. Thierry Onkelinx

Instituut voor natuur- en bosonderzoek / Reseach Institute for Nature
and Forest

Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance

Gaverstraat 4

9500 Geraardsbergen

Belgium

tel. + 32 54/436 185

Thierry.Onkelinx op inbo.be

www.inbo.be 

 

Do not put your faith in what statistics say until you have carefully
considered what they do not say.  ~William W. Watt

A statistical analysis, properly conducted, is a delicate dissection of
uncertainties, a surgery of suppositions. ~M.J.Moroney


-----Oorspronkelijk bericht-----
Van: r-help-bounces op stat.math.ethz.ch
[mailto:r-help-bounces op stat.math.ethz.ch] Namens Shubha Vishwanath
Karanth
Verzonden: woensdag 24 januari 2007 14:13
Aan: r-help op stat.math.ethz.ch
Onderwerp: [R] Conversion of column matrix into a vector without
duplicates

Hi R,

 

I have a matrix A,

 

A=

      [,1] [,2]

[1,]  a     u

[2,]  b     v

[3,]  c     x

[4,]  d     x

[5,]  e     x

 

I want to put the 2nd column of this matrix in a vector without
duplicates. i.e., my vector v should be (u, v, x), whose length is 3.

 

Can anybody help me on this?

 

Thanks in advance

Shubha.


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