Shubha Vishwanath Karanth
2007-Jan-24 13:12 UTC
[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]]
ONKELINX, Thierry
2007-Jan-24 13:24 UTC
[R] Conversion of column matrix into a vector without duplicates
?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]]
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PLEASE do read the posting guide
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and provide commented, minimal, self-contained, reproducible code.
Dimitris Rizopoulos
2007-Jan-24 13:26 UTC
[R] Conversion of column matrix into a vector without duplicates
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
Chuck Cleland
2007-Jan-24 13:27 UTC
[R] Conversion of column matrix into a vector without duplicates
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