Dear Dallazuanna:
Thanks for your reply. It really has solved my problems.
However, I have another question. How can I do, if I need to calculate such
equation in all sub-dataframe? I try to use "A.split[]" to catch all
sub-dataframe, but it seems can not catch the columns of all sub-dataf
Try this:
A.split[[1]]["time"]
A.split[[1]][["concentration"]]
test <- NULL
for(i in 2:4){
test[i] <- (A.split[[1]][["time"]][i] - A.split[[1]][["time"]][i-1]) *
(A.split[[1]][["concentration"]][i] - A.split[[1]][["concentration"]][i-1])
* 0.5
}
On 28/11/2007, leeznar <[EMAIL PROTECTED]>
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