If "dv" is a vector, I'm guessing that the following might give you what you want:
dv[state.to.map][(year == 1980)[state.to.map]]
I assume here that "state.to.map" is a numeric vector of the same length as "dv", and "year" is a numeric vector of the same length. If "dv" is a 3-dimensional array, then the following might return what you want:
dv[state.to.map, drop=F][(year == 1980)[state.to.map],,]
Please check help.start() -> "An Introduction to R" ->
* Simple manipulations numbers and vectors
<#Simple%20manipulations%20numbers%20and%20vectors>:
* Objects <#Objects>:
* Factors <#Factors>:
* Arrays and matrices <#Arrays%20and%20matrices>:
* Lists and data frames <#Lists%20and%20data%20frames>:Hope this helps. spencer graves
Jens Hainmueller wrote:
Hello,
this is a follow up on my previous inquiry regarding the use of the map library (Becker and Wilks 1993).
Using the 'world' database I would like to draw filled countries in a world map so that the filling colors of each country corresponds to the value of a policy variable "fix.float" at a specific "year" (the goal is to visualize a policy diffusion pattern over time using different maps for year=1985, 1990, etc.).
In my dataset [Test] I have created a vector 'map.name' that contains country names that I have made identical to the country names in file world.N in .../library/maps/mapdata/.
Test[1:10,]
region fix.float wbcode name year dv dv.lag map.name polygon 1 lac NA ABW Aruba 1973 NA NA Aruba 1936 2 lac NA ABW Aruba 1974 NA NA Aruba 1936 3 lac NA ABW Aruba 1975 NA NA Aruba 1936 4 lac NA ABW Aruba 1976 NA NA Aruba 1936 5 lac NA ABW Aruba 1977 NA NA Aruba 1936 6 lac NA ABW Aruba 1978 NA NA Aruba 1936 7 lac NA ABW Aruba 1979 NA NA Aruba 1936 8 lac NA ABW Aruba 1980 NA NA Aruba 1936 9 lac NA ABW Aruba 1981 NA NA Aruba 1936 10 lac NA ABW Aruba 1982 NA NA Aruba 1936
Now I would like to translate the country names in the 'world' database to the country names in my dataset (following Becker and Wilks 1993). For some reason, the translation does not work.
map.country<- map(database = "world", names=T,plot=F)Error in dv[state.to.map, year == 1980] : incorrect number of dimensions
state.to.map <- match(map.name,map.country)
color <- dv[state.to.map, year == 1980]
color <- dv[state.to.map, year == 1980]/100Error in dv[state.to.map, year == 1980] : incorrect number of dimensions
What am I doing wrong? (there are a few values missing in "fix.float")
Thanks for your help!
Best Jens Hainmueller
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