R help - Jul 2011 - Creating a flat legend 'grob' for lattice xyplot

Hi,

I want my xyplot legend to be flat, not tall, and there seems to be no way
for xyplot's auto.key and key elements to do this: I tried many, many
permutations of what I could find in the archives and reading the
documentation.  If there there's a way to make it flat, please tell me what
the magic incantation is.

Here's a simple example of what I like to see.  The xyplot will be a
multi-panelled one with a single,
flat legend below.  It seems the xyplot's legend element is the way to go --
the option I haven't tried because I don't know what or how to create a
grob
of this kind.  Where to start?

xyplot(1~1)
legend(0.15,-0.125,
bty='n',pch=rep(c(15,17),2),col=c('brown','green','blue','red'),ncol=4,
          legend=c('How','to make','this into', 'a
grob?'))

Thanks!



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Hi Mark,

I believe the argument you are looking for is column not ncol.
Try the following:

library(lattice)
xyplot(1~1,
auto.key=list(
bty='n',
pch=rep(c(15,17),2),
col=c('brown','green','blue','red'),
columns=4,      
text=c('How','to make','this into', 'a grob?'),
space="top"
))

 
Regards

Markus

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of Mark
Sent: 27 July 2011 18:32
To: r-help at r-project.org
Subject: [R] Creating a flat legend 'grob' for lattice xyplot

Hi,

I want my xyplot legend to be flat, not tall, and there seems to be no way for
xyplot's auto.key and key elements to do this: I tried many, many
permutations of what I could find in the archives and reading the documentation.
If there there's a way to make it flat, please tell me what the magic
incantation is.

Here's a simple example of what I like to see.  The xyplot will be a
multi-panelled one with a single, flat legend below.  It seems the xyplot's
legend element is the way to go -- the option I haven't tried because I
don't know what or how to create a grob of this kind.  Where to start?

xyplot(1~1)
legend(0.15,-0.125,
bty='n',pch=rep(c(15,17),2),col=c('brown','green','blue','red'),ncol=4,
          legend=c('How','to make','this into', 'a
grob?'))

Thanks!



--
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http://r.789695.n4.nabble.com/Creating-a-flat-legend-grob-for-lattice-xyplot-tp3699235p3699235.html
Sent from the R help mailing list archive at Nabble.com.

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On Jul 27, 2011, at 1:31 PM, Mark wrote:
> Hi,
>
> I want my xyplot legend to be flat, not tall, and there seems to be  
> no way
> for xyplot's auto.key and key elements to do this: I tried many, many
> permutations of what I could find in the archives and reading the
> documentation.  If there there's a way to make it flat, please tell  
> me what
> the magic incantation is.
>
> Here's a simple example of what I like to see.  The xyplot will be a
> multi-panelled one with a single,
> flat legend below.  It seems the xyplot's legend element is the way  
> to go --
> the option I haven't tried because I don't know what or how to  
> create a grob
> of this kind.  Where to start?
>
> xyplot(1~1)   # a lattice function
> legend(0.15,-0.125,    # a base graphics function
> bty='n',pch=rep(c(15,17), 
>
2),col=c('brown','green','blue','red'),ncol=4,
>          legend=c('How','to make','this into',
'a grob?'))
It is possible to define a legend object inside xyplot but using the  
base graphics legend() is NOT how it is done. You should provide a  
sample data.frame and someone will show you how to do it. The example  
in Sarkar's Lattice book that does it uses barchart and specifies  
auto.key with a columns= argument. It's fig 10.2 and you can find the  
examples on the website. It's also described in the key section of ? 
xyplot .... I just looked.

-- 
David Winsemius, MD
West Hartford, CT