Hi
r-help-boun...@r-project.org napsal dne 02.02.2011 16:05:21: > > On Feb 2, 2011, at 9:12 AM, ADias wrote: > > > > > Hi > > > > I have this function and this matrix: > > > > function(x,y) x+y/x > > > > m<-matrix(c(1,2,4,2,10,8),3,2) > > > >> m > > [,1] [,2] > > [1,] 1 2 > > [2,] 2 10 > > [3,] 4 8 > > > > each row represent a point (x,y) in a chart and I want via my > > fucntion to > > calculate the image in order to get this results: > > > > for point (1,2) I would get 1+2/1 = 3 > > for point (2,10) I would get 2+10/2 = 7 > > for point (4,8) I would get 4+8/4 = 6 > > > > I have tried using sapply here but I get this: > > > >> sapply(m,function(x,y) x+y/x) > > Error in y/x : 'y' is missing > > I'm not sure what sapply does with a matrix argument. I've only used t > with vectors and lists. I suspect that it would straighten out the > argument to a length = 6 vector. (And then, of course, the "y" > wouldn't be there.) > > > > > > what I am doing wrong? > > Two things: instead use apply() and realize that the argument is > passed as a vector > > apply(m, 1, function(x) x[1] +x[2]/x[1] ) Maybe apply is not necessary here > m[,1]+m[,2]/m[,1] [1] 3 7 6 Regards Petr > > > -- > David Winsemius, MD > West Hartford, CT > > ______________________________________________ > 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.