[R] sourced plot commands not working

[Gavin Simpson]

[Ooops, brain/fingers not well connected today, sent prematurely]

On Wed, 2009-04-08 at 10:05 -0400, SHANE MILLER, BLOOMBERG/ 731 LEXIN
wrote:
> I have source a script running with no errors that ends in these lines:
> ==============
> for (i in 2:3) win.graph()
> dev.set(2)
> levelplot(avg ~ procs * size, rrt, drape=T, colorkey=T,main="ops/sec",scales=list(x=list(tick.number=15),y=list(log=10)))
> dev.set(3)
> levelplot(avg ~ procs * size, ort, drape=T, colorkey=T,main="ops/sec",scales=list(x=list(tick.number=15),y=list(log=10)))
> =============
> The graphics devices windows appear, however, there is no graph
> and the background of each window is gray indicating no active
> graph.
> 
> However, if I copy and paste these commands from the script and
> enter them into the console, they run fine. why?

The plotting commands used here are lattice functions. These need to be printed to
produce the plotting side effect you want. When entered at the command
line printing is explicit. This doesn't happen when sourced.

This is a FAQ 7.22:

http://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-do-lattice_002ftrellis-graphics-not-work_003f

?source does explain all of this.

Solution; wrap your levelplot(...) in print():

print(levelplot(...))

HTH

G

> 
> R 2.8.1 2008-12-22 on windows.
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