[R] matrix and error in points, plot ?

[Prof Brian Ripley]

You have forgotten drop=FALSE in mat[1,]: take a look at what it produces.
See ?Extract for more details.

On Mon, 3 Jan 2005, Patrick Giraudoux H wrote:

> 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?

Not using a matrix at all!

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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