I am trying to do some MDS analysis using the eurodist dataset, however when I plot the configurations I get un upside-down graph:
When I am on classical MDS I can obviate to this by make a reflection on the x-axis with:
X2D=cmdscale(EurDistances, k = 2, eig = TRUE, add = FALSE, x.ret = FALSE)
X2D
require(graphics)
x = X2D$points[,1]
y = X2D$points[,2]
plot(x, -y, type="n", xlab="", ylab="", main="cmdscale(eurodist)")
text(x, -y, rownames(X2D$points), cex=0.8)
Thus I am able to produce the right map:
However, when I do metric MDS is not that obvious to me how to get the x and y points from the smacofSym function and so I don't know how to correct the upside-downess of the plot after the following piece of code:
resm.EurDistances=smacofSym(EurDistances,2)
resm.EurDistances
summary(resm.EurDistances)
plot(resm.EurDistances, main="smacofSym(eurociti,2)")
Any help is appreciated, thank you.