I was given just a distance matrix (I'm talking about distance between cities), and I have to perform a classical multidimensional scaling. But mapping my results, I've noticed that my map is upside down. (For example, Miami is on the left side, Washington is on the right, and so on) Is this normal? My results could get better if I'd had the latitude and longitude?
Here's my R code (as you can see, is not a big deal):
mds<-cmdscale(D,eig=TRUE, k=2) x <- mds$points[,1] y <- mds$points[,2] plot(x, y, xlab="Coordinate 1", ylab="Coordinate 2", main="Metric MDS", type="n") text(x, y, labels = row.names(D), cex=.7)