[STATSGRASS] making R and grass(6.1) play well together.

[Edzer J. Pebesma]

Tom Colson wrote:

>Thanks for the quick reply. 
>
>I did install spgrass6 and all its dependencies and have managed to
>reproduce this:
>
>  
>
>>library(spgrass6)
>>    
>>
>
>  
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>>G <- gmeta6()
>>    
>>
>
>  
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>>dem <- readFLOAT6sp("ncfpm_2694")
>>    
>>
>
>
>
>Specifically, though, I am seeking how to import the raster DEM into
>some sort of format that the stats library will recognize so I can plot
>the ecdf cruves......ie..
>
>library(stats)
>  
>
I think library stats is attached by default, so can be omitted.

>plot(ecdf(dem))
>plot(ecdf(dem), verticals=T, do.points=F)
>  
>

Please try:

dem.df = as.data.frame(dem)
plot(ecdf(dem.df[["ncfpm_2694"]]))

--
Edzer

>
>On Wed, 2005-06-29 at 17:30 +0200, Edzer J. Pebesma wrote:
>  
>
>>Tom, there has been quite a bit of development in this area;
>>first we have made an R package (sp) which has classes and
>>methods for dealing with spatial points, lines, polygons and grid
>>objects in R, and then Roger rewrote the grass R package to
>>work with these data. You can read about it in the latest
>>grass news, and you can see (more) examples on
>>http://r-spatial.sourceforge.net/ , follow the link "sp and other
>>packages" which has examples on spgrass6.
>>
>>Best regards,
>>--
>>Edzer
>>
>>Tom Colson wrote:
>>
>>    
>>
>>>I managed to get R compiled and all the packages talking to grass as it
>>>should, and all the "demos" seem to work. There is a neat tutorial on
>>>working with DEM (grass raster) in R
>>>http://grass.itc.it/statsgrass/learning_r2.html#Working_with_elevation
>>>
>>>Tutorial works great with the sample data provided...yet I can't figure
>>>out how to get "current" raster dems in my mapset/location into a format
>>>that is acceptable to R...re: the tutorial syntax. Been looking through
>>>all the man pages, but there doesn't seem to be any documentation on
>>>raster import that would allow one to go through that tutorial using
>>>one's own data....
>>> 
>>>
>>>      
>>>
>
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