Hi
I've just discovered a potentially nasty bug in grid.
If you have developed code using grid, please check whether this may
affect your code.
The problem occurs when a numeric value is multiplied by a unit object,
e.g., 0.5*unit(1, "inches"). The result will be WRONG if the numeric
has length > 1, e.g., c(0.25, 0.5)*unit(1, "inches").
The problem is illustrated by the following:
grid.segments(x0=1:3/4, y0=0.1, x1=1:3/4,
y1=unit(1:3/4, "npc"),
gp=gpar(col="grey", lwd=5))
grid.segments(x0=1:3/4, y0=0.1, x1=1:3/4,
y1=1:3/4*unit(1, "npc"))
This draws three vertical bars. The thin black bars should be the same
heights as the thick grey bars, but they are not.
A fix for this will be in R version 1.8.1
Paul
--
Dr Paul Murrell
Department of Statistics
The University of Auckland
Private Bag 92019
Auckland
New Zealand
64 9 3737599 x85392
paul@stat.auckland.ac.nz
http://www.stat.auckland.ac.nz/~paul/