Re: [R-sig-Geo] Shortest network path distances

On Thu, 13 Sep 2007, Takatsugu Kobayashi wrote: > Hi, > > I would like to know if there are packages to compute shortest network > path distances, something that can be down on TransCAD and ArcGIS > network analyst. I have cencus tract centroids and network line > shapefiles for 126 US urbanized a

Re: [R-sig-Geo] Shortest network path distances

Hi, I would like to know if there are packages to compute shortest network path distances, something that can be down on TransCAD and ArcGIS network analyst. I have cencus tract centroids and network line shapefiles for 126 US urbanized areas. Basically, I would like to move the census tract c

Re: [R-sig-Geo] memory Usage setting

The thing is I am using a function a recursive algorithm on multi array which could probably be rewritten the way you are describing (subsetting via a database for storage) but ... that would have to be rewritten! thanks again I thanks to the other comments as well Didier Roger Bivand wrote: >

Re: [R-sig-Geo] memory Usage setting

Edzer, This is also my biggest frustration with R at the moment. I can not load grids that are bigger than 2M pixels and run geostatistics on them (if I run the same analysis in a GIS software such as SAGA GIS, then I do not get this problems). I often get messages such as: "Reached total alloca

Re: [R-sig-Geo] memory Usage setting

Agus, not 100% sure but I believe the PAE kernel allows the OS to use more than 4 Gb, but not more than 4 Gb for any single process (such as R is) to be used. So, 2 R processes could each use max 4 Gb RAM without swapping on an 8 Gb RAM machine with PAE kernel. No, I installed a full 64-bit kernel

Re: [R-sig-Geo] memory Usage setting

Any particular advice for setting up the kernel (or other things) for such a machine (i.e., the PAE kernel)? Agus Edzer J. Pebesma escribió: > I think R will never do it's own memory swapping, as that is a typical > OS task. There are however several developments (provided in add-on > packages)

Re: [R-sig-Geo] memory Usage setting

I think R will never do it's own memory swapping, as that is a typical OS task. There are however several developments (provided in add-on packages) that will not load all data in memory at start-up, but instead call some data base whenever a data element is needed. You might search r-help for

Re: [R-sig-Geo] memory Usage setting

On Thu, 13 Sep 2007, Didier Leibovici wrote: > > Thanks Roger > > I feel we've got a low RAM machine which would need a bit of an uplift > (recent server though)! > The linux machine is unfortunately also with 4Gb of RAM > But I persist to say it would be interesting to have within R a way of >

Re: [R-sig-Geo] memory Usage setting

Thanks Roger I feel we've got a low RAM machine which would need a bit of an uplift (recent server though)! The linux machine is unfortunately also with 4Gb of RAM But I persist to say it would be interesting to have within R a way of automatically performing swapping memory if needed ... Did

Re: [R-sig-Geo] Functions for spatio-temporal/space-time analysis?

On Thu, 13 Sep 2007, zhijie zhang wrote: > Dear friends, > I'm conducting some spatio-temporal/space-time analysis for point pattern > data, and the following functions maybe used to do it. > Anybody knows some other functions/methods for spatio-temporal/space-time > analysis in R? > > > stkhat