[R] problem with the image command

[Pascal Oettli]

Hello,

In the case:

image(x=long,y=lat,z=values)),

"long" is not in (strictly) ascending order, according to the sample you 
provided:

plot(long)

Regards,
Pascal


On 04/10/2013 10:28 AM, cassie jones wrote:
> Yes, I did. But I get the following error with the command
> image(x=long,y=lat,z=values)
>
> "Error in image.default(x=long,y=lat,z=values):
>   error in evaluating the argument 'x' in selecting a method for
> function 'image': Error in long: recursive indexing failed at level 2"
>
>
> Thanks,
> Cassie
>
> On Tue, Apr 9, 2013 at 8:16 PM, Pascal Oettli <kridox at ymail.com
> <mailto:kridox at ymail.com>> wrote:
>
>     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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