> On Jun 17, 2016, at 1:06 PM, ch.elahe via R-help <r-help@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!
I would not expect a merger based on the one hand on two letter initials to
match on the other hand fully spelled-out country names.
--
David Winsemius
Alameda, CA, USA
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