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Dear R-experts: I am using a function called AUC whose arguments are data, time, id, and dv. data is the name of the dataframe, time is the independent variable column name, id is the subject id and dv is the dependent variable. The function computes area under the curve by trapezoidal rule, for each subject id. I would like to embed this in aggregate to further subset by each

R Experts: I am trying to isolate the numeric value of day from a string that might look like "Cycle 1 Day 8" or "Cycle 12 Day 15". In essence, what I need is a function that can look at a character string and tell me the location within the string where it matches with a given string. In this case, where within "Cycle 12 Day 15" is the text "Day"

R Experts I'm currently using an S+ script of the following format and would like to convert it to R. The script opens a graphsheet with an associated name, plots something (in this case a boxplot) and then exports the contents of the graphsheet of the assigned name to an EMF file. I've been looking for something in R that would work the same way but to no avail. Could someone

R Experts I wish to tabulate into one data frame statistics summarizing concentration data. The summary is to include mean, standard deviation, median, min and max. I wish to have summaries by Dose, Day and Time. I can do this by calling aggregate once for each of the statistics (mean, standard deviation, median, min and max) and then execute 4 merges to merging the 5 data frames into