
Thanks for the help.
Sharad

On Mon, Sep 27, 2010 at 9:12 PM, Remko Duursma [via R] <
ml-node+2716469-935075351-6232@n4.nabble.com<ml-node%2B2716469-935075351-6232@n4.nabble.com>
> 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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