Re: [R] Reshape a matrix

From: ONKELINX, Thierry <>
Date: Thu, 06 Nov 2008 09:35:32 +0100

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

HTH, Thierry

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

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-----Oorspronkelijk bericht-----
Van: [] Namens dinesh kumar
Verzonden: donderdag 6 november 2008 1:53 Aan:
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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Received on Thu 06 Nov 2008 - 08:37:19 GMT

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