Hello all,
I have data for several states and no data for most. I just want to
subset the states I have data for and ignore the rest.
Is there anyway to do this? I have a shapefile and have read it in with
ReadShapePoly successfully, but I don't need all 50 American states.
Thanks,
Pete
Have you looked into functions such as na.omit()?
Matt
On Sun, May 30, 2010 at 7:54 PM, Peter Larson pslars...@gmail.com wrote:
Hello all,
I have data for several states and no data for most. I just want to subset
the states I have data for and ignore the rest.
Is there anyway to do this?
They don't show up as NA's. They are just 0's. The 0 values in the
states I am interested in are correct, however.
Pete
On 2010/05/30 20:28, Matt Beard wrote:
Have you looked into functions such as na.omit()?
Matt
On Sun, May 30, 2010 at 7:54 PM, Peter Larson pslars...@gmail.com
Well, you need to find some variable to use for subsetting the data.
Can you share an example of your data?
Would something like the following work for you?
stateID - c(AL,AK,AR,CA,DE,FL,GA,MN,WA,WI,WY)
var1 - c(0,0,0,0,0,0,0,0,0,2,0)
df - data.frame(stateID,var1)
statesWanted - c(MN,WI)
It doesn't seem to work. This what I have though.
I have a STATE_NAME variable in the data that I could potentially use,
assuming I know the write syntax.
Any ideas?
Thanks!
Pete
nc_file - system.file(/LynchingHotSpots.shp, package=maptools)[1]
llCRS - CRS(+proj=longlat +datum=NAD27)
nc -
Supposing that your data object is named mydata, try following this example:
mydata[ , STATE_NAME %in% c('name1','name2','name17') ]
replacing my fake state names with the ones you want.
If you have another variable that identifies the subset you want, use
it instead of STATE_NAME.
This
I believe Peter figured it out on his own off list. Here was my solution
using rgdal:
library(rgdal)
# Shapefile's full path is '/home/matt/LynchingHotSpots.
shp' on my computer
# If you had your file at 'C:\data\LynchingHotSpots.shp' you would change
#shpFolder to C:/data and
