Homework? We don't do homework here. -- Bert
On Sun, Feb 17, 2013 at 5:10 AM, Prakasit Singkateera <asltjoey.rs...@gmail.com> wrote: > Hi Experts, > > I have a dataset of 3 columns: > > customer.name product cost > John Toothpaste 30 > Mike Toothpaste 45 > Peter Toothpaste 40 > > And I have a function of cost whereby > > cost = 3.40 + (1.20 * no.of.orders^2) > > I want to do a backward calculation for each records (each customer) to > find his no.of.orders and create a new column named "no.of.orders" in that > dataset but I don't know how to do. > > Please help me. > > Thank you everyone, > Prakasit > > [[alternative HTML version deleted]] > > ______________________________________________ > 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. -- Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm ______________________________________________ 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.