The problem is that the order and number of polygons in map does not match your
data (most likely).
Try:
library(maps)
library(plotrix)
state.col<-color.scale(state.x77[,'HS Grad'],0,0,c(0,1))
map("state",fill=TRUE,col=state.col)
nms <- map('state', plot=FALSE)$names
nms <- sub(':.*$','',nms)
ind <- match(nms, tolower(state.name))
map('state', fill=TRUE, col=state.col[ind])
Now try it with your data, just replace state.name with the names of the states
in the order of your data if it is different (possibly the rownames).
You may also want to look at state.vbm in the TeachingDemos package (works with
maptools rather than maps) as another way to plot colored maps of the USA that
is less affected by geographical area.
Hope this helps,
--
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.s...@imail.org
801.408.8111
> -----Original Message-----
> From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-
> project.org] On Behalf Of Alina Sheyman
> Sent: Thursday, February 19, 2009 9:46 AM
> To: r-help@r-project.org
> Subject: [R] colored maps again
>
> I'm trying to create a colored map that would show the number of
> students
> per state.
> My data frame consists of two columns - state and count.
> I'm using the following code
>
> library(maps)
> map("usa")
> library(plotrix)
> state.col<-color.scale(gre$count,0,0,c(0,1))
> map("state",fill=TRUE,col=state.col)
>
> I'm getting a map, but the values are not being mapped to correct
> states.
> What do I need to do to fix that?
>
> [[alternative HTML version deleted]]
>
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> and provide commented, minimal, self-contained, reproducible code.
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