Hi r-help-boun...@r-project.org napsal dne 08.04.2010 16:23:53:
> > Hi > > So my particular problem is this: > > I have a row vector of length 5200 elements - specifically created by > > x<-rbinom(5200,1,0.5) > y<-matrix(x,nrow=1,ncol=5200) > y > > now, each element is either a 0 or a 1 - e.g. it could be (0,1,1,1,1,0,0,0,1, > 1,1) e.t.c. > > when the element is a 1, i need to multiply a number (say 1000) by 1.005, and > if it is 1 again, multiply it _again_ by 1.005. > > so for example, say i have the vector (1,1). it would be 1000 X 1.005 X 1.005 > > and if the element is 0, then i need to multiply by .995 - i.e. say the vector > was (1,1,0) the value would be > 1000 X 1.005 X 1.005 X .995. > > so my questions are these: > 1. how do i make R do this automatically for each element and > 2. as each term is multiplied, i want to graph the progress of the initial 1000. I am not sure if I understood correctly. Does this do what you want? vec<-sample(c(0,1), 10, replace=T) vec.2<-vec+1 1000*cumprod(c(0.995, 1.005)[vec.2] Regards Petr > > any help would be greatly appreciated. > _________________________________________________________________ > New, Used, Demo, Dealer or Private? Find it at CarPoint.com.au > > [[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. ______________________________________________ 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.
