[R] re ading transposed data in read.csv

[Dieter Menne]

> tdf <- read.table(textConnection("ID  samp1  samp2 samp3 samp4
+ G1       23        32      12      87
+ G2       85        45      49      76
+ G3       12        46      39      28
+ G4       73        26      18      13
+  "), header=T)
> library(reshape)
> recast(tdf, ...~ID)
Using ID as id variables
   variable G1 G2 G3 G4
1    samp1 23 85 12 73
2    samp2 32 45 46 26
3    samp3 12 49 39 18
4    samp4 87 76 28 13
>

see reshape and plyr packages for this kind of data manipulation.


These packages can be helpful if you know what you want, but to start off it
is sometimes more important to do things explicitly. While I think that plyr
is definitively a must, getting the syntax right in reshape often needs
longer than writing the explicit code.

Dieter

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