Agus, according to ?get, x should be a variable name (given as a
character string). So one *should* expect the behaviour that Matthew
describes:
> v = c("r1","r2","r3")
> v
[1] "r1" "r2" "r3"
> get(v)
Error in get(v) : object 'r1' not found
> get('v')
[1] "r1" "r2" "r3"
Carson
On 19 November 20
Thiago,
Dear list members,
> How can I find a polygon centroid? Google shows me a "get.Pcent" function
> within maptools, but it seems to be no longer available...
> Best wishes,
> Thiago.
>
I think coordinates from the sp package will do what you want...
library(sp)
?coordinates
Carson
Hi Roger (and Barry),
> Maybe just do it in the usual way, repeating the i and j specific
variables?
> Unless you want to constrain anything, it shouldn't be more than reshaping
> to long format and rep()'ing the origin and destination variables, should
> it? Maybe provide a link to data and outpu
Hi List,
This question has come up with the past, but I have yet to find a
clear response, so I'm going to ask myself.
Has anyone had much experience with spatial interaction models,
specifically in the form of Poisson regression?
I'm a bit unsure of how to operationalize this using glm(), and wou
Hi Alex,
The National Snow and Ice Data Centre has tonnes of data for snow, swe (snow
water equivalent), and ice for most of the northern hemisphere:
http://nsidc.org/index.html
In particular, have a look at the Global Monthly EASE-Grid datasets. I think
the go as far back as the 70s, though ther
Gianni,
Have a look at the foreach package from REvolution Analytics. This
lets you run each loop of a for loop on a separate processor.
I used it for some bootstrapping work a while back and it works really
nicely and simply:
http://www.carsonfarmer.com/?p=668
Carson
On 2 September 2010 15:23,
You'll probably have more luck sending this query to the rpy mailing list:
rpy-l...@lists.sourceforge.net
http://rpy.sourceforge.net/maillist.html
Carson
On 31 August 2010 23:51, Ricardo Rodríguez wrote:
> hi everyone, I have a error in load module of rpy and rpy2 in console of
> python, how
ivand wrote:
> On Sat, 10 Jul 2010, Carson Farmer wrote:
>
>> Hello list,
>>
>> Does anyone know of a nice way to convert WKT strings to sp Spatial
>> objects? The list archives don't turn up anything conclusive beyond
>> the possibility of doing it using rgeos,
Hello list,
Does anyone know of a nice way to convert WKT strings to sp Spatial
objects? The list archives don't turn up anything conclusive beyond
the possibility of doing it using rgeos, but I was wondering if anyone
knew of a more 'stable', all R way of doing it?
Thanks for any hints or though
Agus,
What about using:
> object.size(b)
which (according to ?object.size) provides an estimate of the memory
that is being used to store an R object.
Carson
On 30 June 2010 12:58, Agustin Lobo wrote:
> Hi!
>
> Is there any way to check if the values of a raster object
> are in memory or in d
Just to bring this up again...
> That only gets you so far. Could Tim please try ogr2ogr with the -sql or
> -where or -spat arguments set to see whether these go in the correct
> direction, that is returning geometries meeting the given selection
> conditions? I have looked briefly at how hard it
Does this help at all?
http://www.carsonfarmer.com/?p=455
Carson
On Fri, May 14, 2010 at 1:39 AM, Josef Fruehwald wrote:
> Hi All,
>
> I'm somewhat of a novice at doing spatial analysis in R, so forgive me if my
> question is obvious, or misposted.
>
> I have a number of points located within th
Hi,
> I only need, for now, to work on two areas: Burgundy and Centre,
> I would like to extract those two areas from the France file,
> I tried, naïvely,
> Centre <- France[France$NAME_1=="Centre", ]
try:
> Centre <- france[fra...@data$name_1=="Centre",]
> PS: I found quite a lot of information
> Since, I cannot manually close all endings, I would like to do find a way to
> create polygons from lines with open endings.
> Any suggestions ...?
If your lines are valid (i.e. correctly ordered pairs of coords), you
could probably just grab the first set of points in the list and add
that to
Hi Germán,
Have a look at package rgdal and the readOGR function.
> library(rgdal)
> ?readOGR
Here is a link with a quick bit on using rgdal to access a postgis table:
http://wiki.intamap.org/index.php/PostGIS
Regards,
Carson
On Thu, Apr 8, 2010 at 11:21 AM, Germán Sánchez
wrote:
> Dear all,
I may be misinterpreting your desired output, but could you not also
perform LISA on this dataset?
For example if you are interested in:
>> highlight[ing] "clusters" (definition unclear!) where there
>> are a number of points "close together" (definition unclear!) and the
>> sum of all the values
Hi Andrew,
Shameless self promotion:
Have a look at manageR (http://www.ftools.ca/manageR).
It is available within the 3rd party repositories in QGIS (the gis it
links with).
If you have any questions regarding dependencies and installation,
please don't hesitate to contact me off list.
Regards,
>... In addition, I use linux (Debian) and the desktop GIS tools that
> I tried (svSig, Qgis, and some more) did not provide publication quality
> maps.
I would strongly suggest you take another look at some of these
packages (especially QGIS).
These are relatively young projects, and are growing
> For super low premiums, click here http://home.webmail.co.za/dd.pwm
>
> ___
> R-sig-Geo mailing list
> R-sig-Geo@stat.math.ethz.ch
> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
--
C
--
Carson Farmer
National Centre for Geocomputation
John Hume Building,
National University of Ireland, Maynooth,
Maynooth,
Co. Kildare,
Ireland.
www.carsonfarmer.com
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Agustin Lobo wrote:
Carson Farmer wrote:
This is certainly where I would like to see manageR go someday! But
unfortunately this would entail programming in C, which requires
someone much more skilled than myself!
For now I simply use it instead of jumping between the two
applications...
Your
ke in GeoDa but with a real GIS diaplay...
Great job!
(I'm forwarding the r-sig-geo list just for them
to know your developments)
Agus
Carson Farmer wrote:
Agustin Lobo wrote:
ok, just installed Rpy 1.0.3
(BTW, should I have uninstalled 1.02? how?)
and manageR loads
on qgis 0.10 on ubuntu
Hello List,
I am trying to find an R package that will accommodate spatially
constrained clustering. While I have been unable to find a package that
is explicitly designed to do spatially constrained clustering, I was
wondering if anyone had found a package that would do constrained
clusterin
e being lost at listw2sn.
Note: I am running R 2.4.1 through the rpy python bindings in qgis (free
open source gis).
Carson Farmer
Spatial Pattern Analysis & Research Lab (SPAR)
Department of Geography, University of Victoria
Victoria, BC, Canada
web: www.geog.uvic.ca/spar
email: [EMAI
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