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

2009-02-23 Thread 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, whi

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

2009-02-23 Thread Alessandro
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