max(dat[dat$condition=="GPR119a", "responce"]) aggregate(dat$responce, by=list(dat$condition), max)
see ?"[" and ?aggregate -Ista On Tue, Feb 1, 2011 at 2:05 PM, A. Ramzan <ar...@cam.ac.uk> wrote: > Hello > > I am trying to find a way to find the max value, for only a subset of a > dataframe, depending on how the data is grouped for example, > > How would I find the maxmium responce, for all the GPR119a condition below: > > responce,mouce,condition > 0.105902,KO,con > 0.232018561,KO,con > 0.335008375,KO,con > 0.387025433,KO,GPR119a > 0.576769897,KO,GPR119a > 0.645120419,KO,GPR119a > 0.2538608,KO,GPR119b > 0.183061952,KO,GPR119b > 0.824035587,KO,GPR119b > 0.399201597,KO,GPR119c > 0.417006618,KO,GPR119c > 0.572958834,KO,GPR119c > 0.229467444,KO,GPR119d > 0.294089745,KO,GPR119d > 0.309964445,KO,GPR119d > 0.30474325,KO,GPR119e > 0.159374839,KO,GPR119e > 0.467726848,KO,GPR119e > 1.01841912,KO,GPR119f > 0.423028621,KO,GPR119f > 0.223588597,KO,GPR119f > > Thank > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- Ista Zahn Graduate student University of Rochester Department of Clinical and Social Psychology http://yourpsyche.org ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
