Dear all,
I found that the code

nm <- c("osm", "maptoolkit-topo", "mapquest",
        "mapquest-aerial", "bing", "stamen-toner",
        "stamen-watercolor", "esri", "esri-topo",
        "nps", "apple-iphoto", "skobbler")
par(mfrow=c(3,4))
#Korea
for(i in 1:length(nm)){
    map <- openmap(c(43.46886761482925,119.94873046875),
            c(33.22949814144951,133.9892578125),
            minNumTiles=3,type=nm[i])
    plot(map)
}

gives me :
Errore: 'merge' is not an exported object from 'namespace:raster'

Where I'm wrong?

sessionInfo():
sessionInfo()
R version 3.0.2 (2013-09-25)
Platform: i686-pc-linux-gnu (32-bit)

locale:
[1] it_IT.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] ggmap_2.3           ggplot2_0.9.3.1     OpenStreetMap_0.3.1
rgdal_0.8-11        raster_2.1-49
[6] rJava_0.9-4         sp_1.0-13

loaded via a namespace (and not attached):
 [1] colorspace_1.2-4    dichromat_2.0-0     digest_0.6.3
grid_3.0.2          gtable_0.1.2
 [6] labeling_0.2        lattice_0.20-23     mapproj_1.2-1
maps_2.3-6          MASS_7.3-29
[11] munsell_0.4.2       plyr_1.8            png_0.1-6
proto_0.3-10        RColorBrewer_1.0-5
[16] reshape2_1.2.2      RgoogleMaps_1.2.0.5 rjson_0.2.13
RJSONIO_1.0-3       scales_0.2.3
[21] stringr_0.6.2       tools_3.0.2


-- 
Ing. Pierluigi De Rosa (PhD)
tel: 075 791 0278 / fax: 075 7823038
cel: 3497558268
skype: pierluigi.derosa

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