[R] Reshape a matrix

ONKELINX, Thierry Thierry.ONKELINX at inbo.be
Thu Nov 6 09:35:32 CET 2008

Dear Dinesh,

Have a look at ?cast for the reshape package

> dataset <- data.frame(Col1 = LETTERS[1:3], Col2 =
sort(rev(LETTERS)[1:3]), value = 1:3)
> dataset
  Col1 Col2 value
1    A    X     1
2    B    Y     2
3    C    Z     3
> library(reshape)
> cast(Col1 ~ Col2, data = dataset, fill = 0)
  Col1 X Y Z
1    A 1 0 0
2    B 0 2 0
3    C 0 0 3



ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research 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 

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-----Oorspronkelijk bericht-----
Van: r-help-bounces op r-project.org [mailto:r-help-bounces op r-project.org]
Namens dinesh kumar
Verzonden: donderdag 6 november 2008 1:53
Aan: r-help op r-project.org
Onderwerp: [R] Reshape a matrix

Dear R users,

I have a matrix like

A      X    1
B      Y    2
C      Z    3

I want to reshape this matrix into this format

    X      Y      Z
A  1
B         2
C                 3

Thanks in advance for your help.


Dinesh Kumar Barupal
Junior Specialist
Metabolomics Fiehn Lab
UCD Genome Center
451 East Health Science Drive
GBSF Builidng
University of California

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