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    <p>Probably not the most straight-forward way of doing it but here is a solution to your first point:</p> <pre><code># First changing the class of the two columns we're going to use: formdate$Formation.Date&lt;-as.Date(formdate$Formation.Date, "%m-%d-%Y") formdate$ISO3&lt;-as.character(formdate$ISO3) formdate$ISO3[8]&lt;-"LAO" #Laos'ISO3 code is "LAO" and not "LOS" in the wrld_simpl data # Make regular temporal interval intval &lt;- cut(formdate$Formation.Date, breaks = seq(min(formdate$Formation.Date),max(formdate$Formation.Date),length=5), right=TRUE, include.lowest=TRUE) # So that the intervals include the lowest date and the highest # Make these values correspond with their polygons library(maptools) data(wrld_simpl) f &lt;- rep(NA,nrow(wrld_simpl@data)) f[sapply(formdate$ISO3,function(x)which(wrld_simpl$ISO3==x))] &lt;- intval # Plot plot(wrld_simpl, col=(1:6)[f]) </code></pre> <p>For your second point:</p> <pre><code>#This time you can define your breakpoints before hand (don't forget to include a minimum age and a maximum age) d &lt;- c("1900/01/01","1945/01/01","1965/01/01","2020/01/01") intval &lt;- cut(formdate$Formation.Date, breaks = as.Date(d)) f &lt;- rep(0,nrow(wrld_simpl@data)) f[sapply(formdate$ISO3,function(x)which(wrld_simpl$ISO3==x))] &lt;- intval </code></pre> <p>and then the plotting:</p> <pre><code>par(mfcol=c(3,1)) #Here, three vertical panels for(i in 1:3){ par(mar=c(0,0,0,0)) plot(wrld_simpl) #First plot the whole world if(any(f==i)){ plot(wrld_simpl[f==i,],add=TRUE,col="red") #Then the countries that belong to the proper category } } </code></pre>
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    1. POCreate World Map with Date Variable
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    1. COGreat work. Thanks.
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