[R] need help on melt/cast

[Dimitris Rizopoulos]

You can use function reshape(), e.g.,

DF <- data.frame(ID = LETTERS[1:3],
     T0 = c(1,4,7), T1 = c(2,5,8), T2 = c(3,6,9))

DF.new <- reshape(DF, idvar = "ID", direction = "long",
     varying = list(2:4), times = names(DF[-1]))
DF.new
DF.new[order(DF.new$ID), ]


I hope it helps.

Best,
Dimitris


On 9/22/2011 3:54 PM, Eugene Kanshin wrote:
> Hello,
> I need to convert dataframe from:
>
> ID   T0   T1   T2
> A    1     2     3
> B    4     5     6
> C    7     8     9
>
> to:
>
> ID Variable Value
> A       T0       1
> A       T1       2
> A       T2       3
> B       T0       4
> B       T1       5
> B       T2       6
> C       T0       7
> C       T1       8
> C       T2       9
>
> i tried to use melt cast but it gives me all the time not exactly what I
> need.
> Thank you.
>
> 	[[alternative HTML version deleted]]
>
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-- 
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center

Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
Tel: +31/(0)10/7043478
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