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

ONKELINX, Thierry Thierry.ONKELINX at inbo.be
Wed Jan 24 14:24:51 CET 2007


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


tel. + 32 54/436 185

Thierry.Onkelinx op 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
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

Hi R,


I have a matrix 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


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