[R-sig-Geo] R+SAGA: Table calculator for shapes

[Alexander Brenning]

Dear Alessandro,

it would be easier to give you a constructive answer if you provided at 
least the code that you used.

The SAGA module that you mention does not (yet) have a front-end 
function in the RSAGA package, so I assume that you are using the 
low-level rsaga.geoprocessor function, which is a bit trickier. I hope 
you have carefully read the information provided by rsaga.get.usage on 
the usage of this module.

Cheers
  Alex


Alessandro wrote:
> Hi all and thanks for help,
> 
>  
> 
> I have a shapefile "canopy_height.shp" with two column "a" and "b". I wish
> to do a-b and to obtain a third column ("a-b"). I am using the R+SAGA
> module: "Table calculator for shapes", and all run good, but when I open the
> shape-file after (in ARCMAP)  I don't see the third column. There is a
> option to save a new shape-file? 
> 
>  
> 
> Thanks for Help
> 
>  
> 
> Ale
> 
>  
> 
>  
> 
> SAGA CMD 2.0.3
> 
> library path:   C:\Windows/modules
> 
> library name:   table_calculus
> 
> module name :   Table calculator for shapes
> 
> author      :   
> 
>  
> 
> error: executing module [Table calculator for shapes]
> 
> Usage: -silent -SHAPES <str> [-FORMULA <str>] [-NAME <str>]
> 
>   -SHAPES:<str>         Shapes
> 
>         Shapes (input)
> 
>   -FORMULA:<str>        Formula
> 
>         Text
> 
>   -NAME:<str>           Field Name
> 
>         Text
> 
> The value for the option 'SHAPES' must be specified.
> 
>  
> 
>  
> 
>> rsaga.geoprocessor(lib="table_calculus", module=2,
> param=list(SHAPES="canopy_height.shp", FORMULA="a-b", NAME="a-b"))
> 
>  
> 
> SAGA CMD 2.0.3
> 
> library path:   C:\Windows/modules
> 
> library name:   table_calculus
> 
> module name :   Table calculator for shapes
> 
> author      :   
> 
> Load shapes: canopy_height.shp...
> 
>  
> 
>  
> 
>  
> 
>  
> 
> Parameters
> 
>  
> 
>  
> 
>  
> 
>  
> 
> Shapes: canopy_height.shp
> 
> Formula: a-b
> 
> Field Name: a-b
> 
> 
> 	[[alternative HTML version deleted]]
> 
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> 

-- 
Alexander Brenning
brenning at uwaterloo.ca - T +1-519-888-4567 ext 35783
Department of Geography and Environmental Management
University of Waterloo
200 University Ave. W - Waterloo, ON - Canada N2L 3G1
http://www.fes.uwaterloo.ca/geography/faculty/brenning/