[R] merging df with world map

[Jeff Newmiller]

You should look at your own data before you post. The information in COUNTRY is not the same as the information in region.

Also, dput is better than str for posting questions. 
-- 
Sent from my phone. Please excuse my brevity.

On June 17, 2016 1:06:29 PM PDT, "ch.elahe via R-help" <r-help at r-project.org> wrote:
>Hi all,
>I want to use world map in ggplot2 and show my data on world map. my df
>is:
>
>
>    $ COUNTRY           : chr  "DE" "DE" "FR" "FR" ..
>
>    $ ContrastColor     : int  9 9 9 9 13 9 9 9 9 ..
>
>$ quant             : Factor w/ 4 levels "FAST","SLOW",..I need to
>merge my df with world_map data which is like this:
>
>    
>    world_map=map_data("world")
>    data.frame':   99338 obs. of  6 variables:
>    $ long     : num  -69.9 -69.9 -69.9 -70 -70.1 ...
>    $ lat      : num  12.5 12.4 12.4 12.5 12.5 ...
>    $ group    : num  1 1 1 1 1 1 1 1 1 1 ...
>    $ order    : int  1 2 3 4 5 6 7 8 9 10 ...
>    $ region   : chr  "Aruba" "Aruba" "Aruba" "Aruba" ...
>    $ subregion: chr  NA NA NA NA ...
>but by merging my df with world map data I get a data frame with zero
>observation in it,I use this command for merging:
>
>
>    world_map=merge(world_map,df,by.x="region",by.y="COUNTRY")
>    str(world_map) 
>
>    'data.frame':   0 obs. of  133 variables:
>    $ region            : chr 
>    $ long              : num 
>    $ lat               : num 
>    $ group             : num 
>    $ order             : int 
>    $ subregion         : chr
>does anyone know what is the problem of this merging that I am
>currently using?
>thanks for any help!
>Elahe
>
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