Thanks for the help.
Sharad
On Mon, Sep 27, 2010 at 9:12 PM, Remko Duursma [via R] <
[email protected]<ml-node%[email protected]>
> wrote:
> Try something like this:
>
>
>
> dfr <- read.table(textConnection(" plate.id well.id Group HYB
> rlt1
> 1 P1 A1 Control SKOV3hyb 0.190
> 2 P1 A2 Control SKOV3hyb 0.210
> 3 P1 A3 Control SKOV3hyb 0.205
> 4 P1 A4 Control SKOV3hyb 0.206
> 5 P1 A5 Control SKOV3hyb 0.184
> 385 P1 A1 ovca SKOV3hyb 0.184
> 386 P1 A2 ovca SKOV3hyb 0.229
> 387 P1 A3 ovca SKOV3hyb 0.214
> 388 P1 A4 ovca SKOV3hyb 0.226
> 389 P1 A5 ovca SKOV3hyb 0.217 "))
>
>
> difs <- lapply(split(dfr,dfr$plate.id), function(x)x$rlt1[x$Group ==
> "Control"] - x$rlt1[x$Group == "ovca"])
> dfr$Diff <- Reduce(c,difs)
>
>
>
> greetings,
> Remko
>
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