R: How to create multiple maps (rworldmap) using apply?

Question

I want to create multiple maps (similar to this example) using the apply family. Here a small sample of my code (~200 rows x 150 cols). (UN and ISO3 are codes for rworldmap):

Answer 1

You are close.

Add this to save one plot per column.

#put column names to plot in a vector
col_names <- names(df)[1:6]


lapply(col_names, function(x) {
  #opens device to store pdf
  pdf(paste0(x,'.pdf'))
  #plots map
  mapCountryData(spdf, nameColumnToPlot=x)
  #closes created pdf 
  dev.off()
})