controlling colour in Trellis histogram

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Does this help?

mydata <- data.frame(OPTIMISM = 
c(29,35,26,22,30,37,29,32,25,35,38,33,41,28,40),
                      PARENTS = rep(c("Both Deceased", "One Deceased", 
"Both Alive"), c(4,5,6)))

library(lattice)

trellis.device(width=7, height=5, new = FALSE, col = FALSE, bg = "white")

histogram(~ OPTIMISM | PARENTS, data=mydata)
Hello.  I am sorry for posting a (seemingly) simple question, but I have
just spent 2 hours trying to find the answer, without success.  I want
to make a histogram with conditioning on a factor, using Trellis
graphics.  However, I do not want any colours (only black and white)
either in the histograms or in the strip.  There must be some simple
argument but I can??t find it.  Here is my code so far:

histogram(~GRC.SLA|as.factor(species.type),data=group.means,
+ strip=function(...)

+
strip.default(...,style=1,factor.levels=c("Conifers","Trees","Herbs","Mo
nocots")))

As a default, this produces the bars in a pale blue and the strip in
orange-yellow.

Chuck Cleland, Ph.D.
NDRI, Inc.
71 West 23rd Street, 8th floor
New York, NY 10010
tel: (212) 845-4495 (Tu, Th)
tel: (732) 452-1424 (M, W, F)
fax: (917) 438-0894
Hello.  I am sorry for posting a (seemingly) simple question, but I
have just spent 2 hours trying to find the answer, without success. 
I want to make a histogram with conditioning on a factor, using
Trellis graphics.  However, I do not want any colours (only black and
white) either in the histograms or in the strip.  There must be some
simple
trellis.device(color = FALSE) 
## assuming you want the default device. 
## See ?trellis.device for more options

histogram(<...>)

Deepayan
Dear bill,

Try opening the Trellis graphics device with trellis.device(color=FALSE).

I hope this helps,
 John
-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch 
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Bill Shipley
Sent: Friday, October 01, 2004 9:17 AM
To: R help list
Subject: [R] controlling colour in Trellis histogram

Hello.  I am sorry for posting a (seemingly) simple question, 
but I have just spent 2 hours trying to find the answer, 
without success.  I want to make a histogram with 
conditioning on a factor, using Trellis graphics.  However, I 
do not want any colours (only black and white) either in the 
histograms or in the strip.  There must be some simple 
argument but I can??t find it.  Here is my code so far:

histogram(~GRC.SLA|as.factor(species.type),data=group.means,
+ strip=function(...)

+
strip.default(...,style=1,factor.levels=c("Conifers","Trees","
Herbs","Mo
nocots")))

As a default, this produces the bars in a pale blue and the 
strip in orange-yellow.

Thanks.

Bill Shipley

Subject Matter Editor, Ecology

North American Editor, Annals of Botany

D??partement de biologie, Universit?? de Sherbrooke,

Sherbrooke (Qu??bec) J1K 2R1 CANADA

Bill.Shipley at USherbrooke.ca

 <http://callisto.si.usherb.ca:8080/bshipley/>
http://callisto.si.usherb.ca:8080/bshipley/

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   Does this help?

mydata <- data.frame(OPTIMISM =
c(29,35,26,22,30,37,29,32,25,35,38,33,41,28,40),
                      PARENTS = rep(c("Both Deceased", "One
Deceased", "Both Alive"), c(4,5,6)))

library(lattice)

trellis.device(width=7, height=5, new = FALSE, col = FALSE, bg =
"white")
The bg="white" is redundant if color=FALSE. 

Incidentally, if color=TRUE, setting bg="white" is IMO bad practice 
(although it seemed like a good idea at the time), since it creates 
settings with a white background while the other colors are only 
suitable for a dark background. To make it more difficult for users to 
achieve this, the 'bg' argument has been dropped from trellis.device in 
2.0.0.

Deepayan