R help - Jan 2007 - 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.


	[[alternative HTML version deleted]]

?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.


	[[alternative HTML version deleted]]

______________________________________________
R-help op stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

you need: unique(A[, 2])


Best,
Dimitris

----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm


----- Original Message ----- 
From: "Shubha Vishwanath Karanth" <shubhak at ambaresearch.com>
To: <r-help at stat.math.ethz.ch>
Sent: Wednesday, January 24, 2007 2:12 PM
Subject: [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.
>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide 
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 

Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm

Shubha Vishwanath Karanth wrote:
> 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?
> A <-
matrix(c("a","b","c","d","e","u","v","x","x","x"),
ncol=2)
> A[,2]
[1] "u" "v" "x" "x" "x"
> unique(A[,2])
[1] "u" "v" "x"
> is.vector(unique(A[,2]))
[1] TRUE

  You probably could have helped yourself by checking the results of
RSiteSearch("duplicate") .
> Thanks in advance
> 
> Shubha.
> 
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
-- 
Chuck Cleland, Ph.D.
NDRI, Inc.
71 West 23rd Street, 8th floor
New York, NY 10010
tel: (212) 845-4495 (Tu, Th)
tel: (732) 512-0171 (M, W, F)
fax: (917) 438-0894