This really doesn't have anything to do with finance, but I was bored waiting for something to run. Please direct any questions to me off-list or to R-help, since this is not on-topic for this list.
On Tue, Jan 4, 2011 at 12:54 PM, Graham Smith <[email protected]> wrote: > Posted on R-help, but it has been suggested that I also post here. > > I assume this has a "proper" name, but I don't know what it is and wondered > if anyone knew of a package that might do the following, or something > similar. > > As an example, assume I have borrowed and read 10 books on R , and I have > subjectively given each of them a "value" score in terms of how useful I > think they are. I also know how much each costs in terms of money. > set.seed(21) p <- trunc(runif(10)*100) # prices v <- trunc(runif(10)*10) # values > What I would like to do is to calculate the costs of every possible > combination of the 10 books, and plot the total monetary value for each of > these possible combination with their associated subjective value totals, > to help decide which combination of books represents the best value for > money. > bk <- letters[1:10] # books nb <- 3 # number of books to choose pc <- combn(p,nb,sum) # price combinations of 3 books vc <- combn(v,nb,sum) # value combinations of 3 books bc <- combn(bk,nb) # books in each combination plot(vc/pc) # value for money bc[,which.max(vc/pc)] # best combination of value for money > I know that some specialist decision analysis software does this sort of > thing, but was hoping R might have an appropriate package. > Everything above was done with the base R packages. Best, -- Joshua Ulrich | FOSS Trading: www.fosstrading.com > Many thanks, > > Graham > > [[alternative HTML version deleted]] > > _______________________________________________ > [email protected] mailing list > https://stat.ethz.ch/mailman/listinfo/r-sig-finance > -- Subscriber-posting only. If you want to post, subscribe first. > -- Also note that this is not the r-help list where general R questions > should go. > _______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-sig-finance -- Subscriber-posting only. If you want to post, subscribe first. -- Also note that this is not the r-help list where general R questions should go.
