Re: [R-sig-Geo] substract two columns in a shapefile (but SAGA+R has an bug error)

2009-02-24 Thread Roger Bivand
On Tue, 24 Feb 2009, Alessandro wrote: Dear Researcher, I have a shapefile with two columns "a" and "b" and I wish to subtract a-b to obtain a new column of difference. I tried in SAGA + R with the module "Table calculator for shapes". This worked without an error, but it didn't save the res

[R-sig-Geo] substract two columns in a shapefile (but SAGA+R has an bug error)

2009-02-24 Thread Alessandro
Dear Researcher, I have a shapefile with two columns "a" and "b" and I wish to subtract a-b to obtain a new column of difference. I tried in SAGA + R with the module "Table calculator for shapes". This worked without an error, but it didn't save the results either. I suspect that this is a bug