[R] How to manipulate a data frame

[Ben Bolker]

affy snp wrote:
> 
> Dear list,
> I have a data frame like:
> 
>> log2.ratios[1:3,1:4]
>        Clone                  a1             a2             a3
> 1 GS1-232B23      -0.0207500 0.17553833  0.21939333
> 2 RP11-82D16      -0.1896667 0.02645167 -0.03112333
> 3 RP11-62M23      -0.1761700 0.08214500 -0.04877000
> 
> how to make it to look like:
> 
>> log2.ratios[1:3,1:4]
>                                  a1             a2             a3
>      a4
> GS1-232B23      -0.0207500 0.17553833  0.21939333     0.0008
> RP11-82D16      -0.1896667 0.02645167 -0.03112333     0.007
> RP11-62M23      -0.1761700 0.08214500 -0.04877000    0.7666
> 

log2.ratios = data.frame(
  Clone=c("GS1-232B23",
"RP11-82D16",
"RP11-62M23"),
  a1= c(-0.0207500,-0.1896667,-0.1761700),
  a2 = c(0.17553833,0.02645167,0.08214500),
  a3 = c(0.21939333,-0.03112333,-0.04877000),
  a4 = c(0.0008,0.007,0.7666))

log2.ratios[1:3,1:4]

rownames(log2.ratios) <- as.character(log2.ratios[,1])
log2.ratios <- log2.ratios[,-1]  



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