Sorry: I forgot to say that you need latticeExtrato use c.trellis.Then:
library(latticeExtra)
c(dummy, dummy, dummy, dummy).

Oscar

El miércoles 7 de marzo de 2012, Mauricio Zambrano-Bigiarini <
hzambran.newsgroups@gmail.com> escribió:
> 2012/3/7 Oscar Perpiñán Lamigueiro <oscar.perpinan@upm.es>:
>> Mauricio Zambrano-Bigiarini <mauricio.zambrano@jrc.ec.europa.eu> writes:
>>
>>> On 07/03/12 13:11, Oscar Perpiñán Lamigueiro wrote:
>>>> Mauricio Zambrano-Bigiarini<mauricio.zambrano@jrc.ec.europa.eu>
 writes:
>>>>
>>> The real problem appears when I try to produce several spplots within
>>> the same figure (each one of them for a different spatial area), with
>>> a unique legend for all the figures (that is the reason why I can not
>>> use 'legend' command).
>>
>> Then you could use c.trellis:
>>
>> With your example:
>>
>> c(dummy, dummy, dummy, dummy).
>>
>> Inside c() you can define the 'layout' and decide if you want to merge
>> legends with 'merge.legends'.
>>
>> Oscar.
>
> Thanks Oscar.
>
> i followed the examples in c.trellis, but it doesn't work:
>
> library(sp)
> xyz = data.frame(expand.grid(x=1:10,y=1:10),rnorm(100))
> coordinates(xyz)=~x+y
>
> # only to get the default values from 'auto.key'
> dummy <- spplot(xyz, cex=10, alpha=0.7)
>
> # checking that 'dummy' is a trellis
> class(dummy)
>
> library(lattice)
> cObj <- c(dummy, dummy)
> update(cObj)
>
> Error en eval(expr, envir, enclos) :
>  '...' usado en un contexto incorrecto # EN: '...' used in an invalid
context
>
> Also, in the documentation of c.trellis, it is mentioned that "Many
> properties of the display, such as titles, axis settings and aspect
> ratio will be taken from the first object only.", so if the spatial
> extent of the figures are different, 'c.trellis' shouldn't do the
> work, right ?
>
> Thanks again,
>
> Mauricio
>
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