r - Save map so it can be automatically use in by-loops -


i make several species maps. problem when using by command, has create map every time iteration made. know if possible save map somehow can used automatically.

i tried recordplot() function, gives me error , generate blank maps:

library(raster)  elevation <- getdata("alt", country = "es", mask=f) slope <- terrain(elevation, opt = "slope",neighbors=4)  aspect <- terrain(elevation, opt = "aspect",neighbors=4) hill <- hillshade(slope, aspect, 40, 270) newextent<-extent(-7.99, -2.87, 39.9, 41.5) land.pal <- colorramppalette(c("#336600", "#f3ca89", "#d9a627",                                 "#a49019", "#9f7b0d", "#996600",                                 "#b27676", "#c2b0b0", "#e5e5e5",                                 "#ffffff"), space="lab") (1000)  plot(disaggregate(crop(elevation,newextent), 20, method="bilinear"), col = land.pal, legend=f)    map <- recordplot()  by(data, data$species, fun = function(data) {   pdf(file=paste0("map ", data$species,".pdf"), onefile=f, width=6,height=3, pointsize=1)   plot.new()   map     points(data$lat, data$long, pch=21, bg="black", cex=0.85)   dev.off() })

thank in advance

data:

lat long    species -6.99   40.49   sp1 -5.05   40.60   sp1 -3.30   40.02   sp1 -7.51   40.86   sp1 -3.18   40.24   sp1 -3.83   40.08   sp1 -7.28   40.91   sp1 -7.74   40.53   sp1 -7.72   40.69   sp1 -4.36   40.06   sp1 -5.90   40.51   sp2 -5.56   40.07   sp2 -3.52   40.19   sp3 -6.29   40.93   sp3 -6.77   40.12   sp3 -7.11   40.77   sp4 -5.81   40.88   sp4 -5.27   40.68   sp4 -6.31   40.34   sp4 -6.13   40.32   sp4 -6.73   40.99   sp4 -5.32   40.71   sp4 -6.17   40.97   sp4 -4.77   40.92   sp4 -6.45   40.58   sp5 -5.54   40.39   sp5 -6.56   40.66   sp5 -5.27   40.37   sp5


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