[R] matrix and error in points, plot ?

[Patrick Giraudoux H]

Hi,

Would a specialist of the "point" or "plot" functions try the following:

mat<-matrix(c(1.836767,4.025989,0.6396777,0.3764444),ncol=2)
plot(mat)
points(mat[1,],col="red")

..A lag appears on x for mat [1,1] between the two displays.

I wonder if this example may be due to a bug or to the mis-use of a matrix 
in the plot() points()  functions. In case of mise-use which kind can it be?

I am working with R 2.0.1 and Windows XP.

Cheers,

Patrick Giraudoux