Dear all, I need some help. I have some problems trying to use the packages for linear programming. I've loaded the packages to R but when I try to use the function R sends an error warning. I don't know if something is missing This is what it shows> # Set up problem: maximize > # x1 + 9 x2 + x3 subject to > # x1 + 2 x2 + 3 x3 <= 9 > # 3 x1 + 2 x2 + 2 x3 <= 15 > # > f.obj <- c(1, 9, 3) > f.con <- matrix (c(1, 2, 3, 3, 2, 2), nrow=2, byrow=TRUE) > f.dir <- c("<=", "<=") > f.rhs <- c(9, 15) > lp ("max", f.obj, f.con, f.dir, f.rhs)Error: couldn't find function "lp" Thank you all ARC
Sec.FACEA wrote:> Dear all, > > I need some help. > I have some problems trying to use the packages for linear programming.What are "the packages for linear programming"?> I've loaded the packages to R but when I try to use the function R sendsHave you installed it prior to loading it? Any warnings or errors from library()?> an error warning. > I don't know if something is missing > This is what it shows > >> # Set up problem: maximize >> # x1 + 9 x2 + x3 subject to >> # x1 + 2 x2 + 3 x3 <= 9 >> # 3 x1 + 2 x2 + 2 x3 <= 15 >> # >> f.obj <- c(1, 9, 3) >> f.con <- matrix (c(1, 2, 3, 3, 2, 2), nrow=2, byrow=TRUE) >> f.dir <- c("<=", "<=") >> f.rhs <- c(9, 15) >> lp ("max", f.obj, f.con, f.dir, f.rhs) > > Error: couldn't find function "lp"Is lp() in the package you have loaded? Citing the footer of each R-help message: PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Uwe Ligges> Thank you all > ARC > > > > > > > ------------------------------------------------------------------------ > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html