[R] How to create a list of trellis objects for grid.arrange()

[Duncan Mackay]

Hi

I did not have a look at this when it was sent as I thought it dealt with
ggplot objects 

If you have trellis objects (check by str())or ?class) try printing them 

print(p2, position = (c(0,0,1,0.5), more =T)
print(p1, position = (c(0,0.5,1,1), more = F)

The only other way that I can think of is using viewports
 ? grid::viewports

If it is base graphics then ? layout  may fix it

Regards

Duncan

Duncan Mackay
Department of Agronomy and Soil Science
University of New England
Armidale NSW 2351
Email: home: mackay at northnet.com.au

-----Original Message-----
From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Agustin Lobo
Sent: Thursday, 27 October 2016 23:58
To: r-help at r-project.org
Subject: [R] How to create a list of trellis objects for grid.arrange()

Given
require(raster)
require(sp)
require(gridExtra)

f <- system.file("external/test.grd", package="raster")
r <- raster(f)
p1 <- spplot(r)
p2 <- spplot(r)

I would like to plot the equivalent to

grid.arrange(p1,p2,ncol=1,nrow=2)

but keeping the trellis objects p1 and p2 within one single object (as
in practice I have many objects generated within a for() loop).

The following used to work:
ps <- c(p1,p2)
grid.arrange(ps,ncol=1,nrow=2)

but does not work any more.

How should I combine p1 and p2 into one single object that would be
accepted by grid.arrange?

Thanks
-- 
Agustin Lobo
aloboaleu at gmail.com

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