Barry Rowlingson wrote:
>Wouter Buytaert wrote:
>
>
>
>>The resulting R function doesn't seem very complicated. I'm a newbie
>>though, so all recommendations welcome:
>>
>>topidx <- function(map) {
>>
>>if(!(class(map) == "SpatialGridDataFrame"))
>> printf("Map should be of SpatialGridData
On Tue, 2006-03-07 at 17:39 +, Barry Rowlingson wrote:
> Tim Keitt wrote:
>
> > That's a rather odd aspect of S methods
>
> one of many :)
>
> I think this stems from the S3 way that what other languages call
> "methods of objects", R has as global namespace functions. In Python for
>
Tim Keitt wrote:
> That's a rather odd aspect of S methods
one of many :)
>-- even if you only want to call
> the function for a single class, you have to create a generic function.
> In cases where I'm not wanting polymorphic behavior (the function really
> only makes sense for a single clas
On Tue, 2006-03-07 at 16:24 +, Barry Rowlingson wrote:
> Wouter Buytaert wrote:
>
> > The resulting R function doesn't seem very complicated. I'm a newbie
> > though, so all recommendations welcome:
> >
> > topidx <- function(map) {
> >
> > if(!(class(map) == "SpatialGridDataFrame"))
> >
Wouter Buytaert wrote:
> The resulting R function doesn't seem very complicated. I'm a newbie
> though, so all recommendations welcome:
>
> topidx <- function(map) {
>
> if(!(class(map) == "SpatialGridDataFrame"))
> printf("Map should be of SpatialGridDataFrame class")
>
Recommendation
Thanks for the info!
Learning the .Call interface is certainly no problem of course. I just
thought about going with .C() because:
- the "writing R extensions" manual says you should consider .C before
using .Call
- it is easy to pass the map values as a double vector, and only a few
addition
Dear Gregor,
here's my contribution:
http://arcdata.esri.com/data_downloader/DataDownloader?part=10200&stack=
back
ESRI lets you zoom on the world map and download the relevant
shapefiles. I have used them and it works just fine for country
boundaries. There is Slovenija too (the maps look post-
On Tue, 7 Mar 2006, Edzer J. Pebesma wrote:
> Wouter, if you want to use the .C interface, you need to pass
> the maps as simple vectors. I would pass one with the map
> values, and one with the topology. Below is some example
> code how to get them. An R function should be used to do
> the coerci
Wouter, if you want to use the .C interface, you need to pass
the maps as simple vectors. I would pass one with the map
values, and one with the topology. Below is some example
code how to get them. An R function should be used to do
the coercion to double arrays, and wrap the .C call.
Please note
Hi,
I want to write some R functions for calculating hydrological
catchment characteristics from a DEM (topographic index, overland flow
delay function etc.).
Looks like using a DEM with SpatialGridDataFrame class as an input is a
good idea.
Then what is the best way to extract the data matr
> > There are plenty of sources of
> > border maps, but getting something matching the borders you need may
> > require a bit of googling (usually looking for a vector representation).
>
> Yes, my country is missing ;)
>
> > Does anybody have recommended websites for current European national
On Tue, 7 Mar 2006, Edzer J. Pebesma wrote:
> Yong Li wrote:
>
> >Dear Friends,
> >
> >Can anybody help me for the subject?
> >When I tried to use write.asciigrid to export a spatialgrid to esri
> >ascii grid, I always failed because of the message "non-square grid
> >is not support" even I kne
On Mon, 6 Mar 2006, Gregor Gorjanc wrote:
> Roger Bivand wrote:
> > On Mon, 6 Mar 2006, Gregor Gorjanc wrote:
> >
> >
> >>Hello!
> >>
> >>I am a total newbie to map handling, but a keen R user. I have some
> >>estimates by numbers per country (in names, such as Germany, France,
> >>...) and woul
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