Hi,
Did you carefully read the help for "image" ?
## Default S3 method:
image(x, y, z, zlim, xlim, ylim, col = heat.colors(12),
add = FALSE, xaxs = "i", yaxs = "i", xlab, ylab,
breaks, oldstyle = FALSE, useRaster, ...)
Regards,
Pascal
On 04/10/2013 10:07 AM, cassie jones wrote:
Hello R-users,
I am trying to do an image plot where I have been given latitudes,
longitudes and the values at the corresponding locations. A sample of the
data is given as follows:
values=c(0,1,0,0,0,0,2,2,0,0)
lat=c(29.6660,29.6756,29.3492,29.2654,29.2827,29.4070,35.3510,35.6590,35.7587,38.2794)
long=c(-95.8121,-95.6565,-95.5771,-95.4400,-95.4356,-95.0294,-81.7940,-81.4850,-81.3777,-86.9999)
I used the following command to generate the image plot along with an U.S.
map:
library(maps)
image(values,x=sort(long),y=sort(lat))
map("state",add=T)
But every time I run the code I get the following error:
Error in image.default(values,x=sort(long),y=sort(lat),
increasing 'x' and 'y' values expected
Even though I sort the latitude and longitude in increasing order, I am
getting this error. Any help is greatly appreciated.
Thanks in advance,
Cassie.
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