Weird problem redirecting lattice graph to a file

Hello,

I am having this weird issue where I cannot send a lattice graph to a device
like pdf() or png(), but this only happens when the statement is inside a
function. For example, this works:
a <- matrix(0,5,5)
pdf("test.pdf")
levelplot(a)
dev.off()
But now, put the last three statements in a function (F(a)) and the pdf is
not produced. I tried replacing pdf with
trellis.device(device="pdf",file="test.pdf") and it still does not work.

Funny thing is that plot() or image() will work inside a function as
expected when re-directing to other devices, but not any of the lattice
functions.

Any ideas?

Thanks,

Jorge
Jorge A. Ahumada, Ph.D.
Technical Director, TEAM
Center for Applied Biodiversity Science
Conservation International
1919 M Street, NW Suite 600
Washington, DC 20036-3521
Ph: 202-912-1516

j.ahumada at conservation.org
http://www.teaminitiative.org/
Replace levelplot(a) by print(levelplot(a)) and you
should be fine.  Lattice functions return a trellis
object which has to be explicitly printed.  If you
type levelplot(a) on the command line, there is
an implicit call to print(), which has the desired
effect.

John Maindonald             email: john.maindonald at anu.edu.au
phone : +61 2 (6125)3473    fax  : +61 2(6125)5549
Centre for Mathematics & Its Applications, Room 1194,
John Dedman Mathematical Sciences Building (Building 27)
Australian National University, Canberra ACT 0200.

Hello,

I am having this weird issue where I cannot send a lattice graph to  
a device
like pdf() or png(), but this only happens when the statement is  
inside a
function. For example, this works:

a <- matrix(0,5,5)
pdf("test.pdf")
levelplot(a)
dev.off()
But now, put the last three statements in a function (F(a)) and the  
pdf is
not produced. I tried replacing pdf with
trellis.device(device="pdf",file="test.pdf") and it still does not  
work.

Funny thing is that plot() or image() will work inside a function as
expected when re-directing to other devices, but not any of the  
lattice
functions.

Any ideas?

Thanks,

Jorge
-- 
Jorge A. Ahumada, Ph.D.
Technical Director, TEAM
Center for Applied Biodiversity Science
Conservation International
1919 M Street, NW Suite 600
Washington, DC 20036-3521
Ph: 202-912-1516

j.ahumada at conservation.org
http://www.teaminitiative.org/

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Hello,

I am having this weird issue where I cannot send a lattice graph to a device
like pdf() or png(), but this only happens when the statement is inside a
function. For example, this works:
It's a FAQ.

    7.22 Why do lattice/trellis graphics not work?

 	-thomas
a <- matrix(0,5,5)
pdf("test.pdf")
levelplot(a)
dev.off()
But now, put the last three statements in a function (F(a)) and the pdf is
not produced. I tried replacing pdf with
trellis.device(device="pdf",file="test.pdf") and it still does not work.

Funny thing is that plot() or image() will work inside a function as
expected when re-directing to other devices, but not any of the lattice
functions.

Any ideas?

Thanks,

Jorge
-- 
Jorge A. Ahumada, Ph.D.
Technical Director, TEAM
Center for Applied Biodiversity Science
Conservation International
1919 M Street, NW Suite 600
Washington, DC 20036-3521
Ph: 202-912-1516

j.ahumada at conservation.org
http://www.teaminitiative.org/

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R-SIG-Mac mailing list
R-SIG-Mac at stat.math.ethz.ch
https://stat.ethz.ch/mailman/listinfo/r-sig-mac

Thomas Lumley			Assoc. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle