[R] Coloring counties on a full US map based on a certain criterion

[Dimitri Liakhovitski]

>
> But the help does say that additional arguments are passed to lines(),
> so you can use lty=0.
>
> That can leave white bits between counties if the areas don't line up
> precisely, so I think it looks better with the lines in black.

I agree, indeed it leaves white bits. Of course, I could try to change
the type of the lines using lty...
Sorry for one more question: can one change the color of these lines
(borders between counties) from black?
Thank you!
D.


>
> Sarah
>
>> Thank you!
>> Dimitri
>>
>> ### My criterion for all counties.:
>> allcounties<-data.frame(county=map('county', plot=FALSE)$names)
>> allcounties$group<-c(rep(1:6,513),rep(1,4))[order(c(rep(1:6,513),rep(1,4)))]
>> ### My colors:
>> classcolors <- rainbow(6)
>> map('county',fill=TRUE,col=classcolors[allcounties$group])
>> map('state', lwd=2, add=TRUE)
>>
>>
>>
>>> Sure. Just start with
>>> map('county')
>>> instead.
>>> I like to add something like:
>>> map('state', lwd=3, add=TRUE)
>>
>> I am trying:
>> ### My criterion for all counties in the US:
>> allcounties<-data.frame(county=map('county', plot=FALSE)$names)
>> allcounties$group<-sample(1:5,3082,replace=TRUE)
>> ### My colors:
>> classcolors <- rainbow(5)
>> ### Trying to build the map - not working:
>> map(database='usa',regions='county',fill=TRUE,col=classcolors[allcounties$group])
>>
>>
>>
>>> You'll need to instead coordinate with the names of the entire US:
>>>> length(map('county', plot=FALSE)$names)
>>> [1] 3082
>>>
>>> Sarah
>>>
> --
> Sarah Goslee
> http://www.functionaldiversity.org



-- 
Dimitri Liakhovitski
marketfusionanalytics.com