Hi Experts, The following codes work when the return value is a scalar. But I like to get the whole vector instead of one element of the vector x using map as a data frame instead getting one element of the vector using of map_dbl. In other words, I would like a data frame with one row for each iteration. I would appreciate your help. Thanks. Chetty __________________________________________ library(matlib) v<-c(0.6,0.3,0.1,0.5,0.3,.2,0.1,0.2,0.8) markov<-function(v){ nrow<-sqrt(length(v)) B<-matrix(v,nrow=nrow,byrow=TRUE) A.sub<-t(B)[1:nrow-1,]-diag(nrow)[1:nrow-1,] A<-rbind(A.sub,c(rep(1,nrow))) b<-c(rep(0,nrow-1),1) x<-solve(A,b) x[2] } df<-data.frame(v.1=c(0.05,0.95,0.2,0.8),v.1=c(0.01,0.90,0.4,0.6)) df%>% map(~markov(v,v =.)) map_dbl(df,markov) ________________________________________
Professor of Family Medicine Boston University Tel: 617-414-6221, Fax:617-414-3345 emails: chett...@gmail.com,vche...@bu.edu [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.