[R] maptools package

[Aleksandr Andreev]

OK, that loads the shape file.

But now when I do:

submap <- subset(spb, as.character(spb$Name) == 'Vasilevsky Island')

the submap still has the whole city, not just the subset. Is there now
a different way of extracting a subset from a map?

A

2010/11/10 Phil Spector <spector at stat.berkeley.edu>:
> Aleksandr -
>   What happens when you use
>
> library(maptools)
> spb = readShapePoly('/home/sasha/Documents/maps/spb.shp')
>
>                                        - Phil Spector
>                                         Statistical Computing Facility
>                                         Department of Statistics
>                                         UC Berkeley
>                                         spector at stat.berkeley.edu
>
>
>
> On Wed, 10 Nov 2010, Aleksandr Andreev wrote:
>
>> A few years back, I wrote some code to plot maps with the maptools
>> package. Now I am trying to reproduce my results, only to find out
>> that maptools has been updated and my code no longer works.
>>
>> I've been able to fix the first part of it by forcing
>> spb <- maptools:::read.shape("/home/sasha/Documents/maps/spb.shp")
>>
>> (as read.shape has been deprecated)
>>
>> but now when I do
>> plot(spb, xlab="Longitude", ylab="Latitude", main="Map of St
>> Petersburg, Russia")
>>
>> I get the message
>> Error in xy.coords(x, y, xlabel, ylabel, log) :
>>  'x' is a list, but does not have components 'x' and 'y'
>>
>> What's the new syntax that I'm supposed to use?
>>
>> I'm using R version 2.12.0 (2010-10-15) on x86_64-pc-linux-gnu (64-bit)
>>
>> Thanks,
>>
>> ------------------------
>> Aleksandr Andreev
>> Graduate Student - Department of Economics
>> University of North Carolina at Chapel Hill
>> Mobile: +1 303 507 93 88
>> Skype: typiconman
>>
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>>
>