z.ch
[mailto:r-sig-geo-boun...@stat.math.ethz.ch] On Behalf Of van Etten,
Jacob (IRRI)
Sent: Tuesday, May 12, 2009 11:46 AM
To: milton ruser
Cc: r-sig-geo@stat.math.ethz.ch
Subject: Re: [R-sig-Geo] Fwd: clump of binary pixels on raster package
Clumps (patches) from binary pixels
This is a solut
__
From: milton ruser [mailto:milton.ru...@gmail.com]
Sent: Tuesday, May 12, 2009 2:04 AM
To: van Etten, Jacob (IRRI)
Cc: r-sig-geo@stat.math.ethz.ch
Subject: Re: [R-sig-Geo] Fwd: clump of binary pixels on raster package
Dear Dylan and Jacob,
In fact I not wrote to GRASS list,
This seems to be a connected components problem, discussed recently on
this list.
Jacob.
-Original Message-
From: r-sig-geo-boun...@stat.math.ethz.ch
[mailto:r-sig-geo-boun...@stat.math.ethz.ch] On Behalf Of milton ruser
Sent: Monday, May 11, 2009 5:30 AM
To: r-sig-geo@stat.math.ethz.ch
S
gdistance, available on R-Forge. It works with raster also available on
R-Forge.
Jacob.
-Original Message-
From: r-sig-geo-boun...@stat.math.ethz.ch
[mailto:r-sig-geo-boun...@stat.math.ethz.ch] On Behalf Of Huizhu
"Chrissy" Li
Sent: Friday, May 01, 2009 12:28 PM
To: r-sig-geo@stat.math.et
Mark,
The package igraph has a quick connected component algorithm,
implemented in C.
You would first need to create a graph from your grid, connecting
adjacent cells. Raster (downloadable from R-Forge) has the function
'adjacency' that might be helpful in doing that (plus other
functionality th
Dear Chuanwen
You could write a new function around identify() that looks for the
observation ID, looks up the corresponding picture and plots it. None of
the spatial packages will do this automagically.
Jacob
-Original Message-
From: r-sig-geo-boun...@stat.math.ethz.ch
[mailto:r-sig-geo
Hastie et al. say that k-fold CV with a low k can overestimate the error if
there is still significant learning going on when the size of the training set
approaches n-n/k.
Leave-one-out CV, on the other hand, is free of this bias but has a high
variance, which is why Hastie et al. dislike it
Medieval cathedrals, that is. And bazaars also the real ones.
-Original Message-
From: b.rowling...@googlemail.com on behalf of Barry Rowlingson
Sent: Sat 17/01/2009 21:44
To: van Etten, Jacob (IRRI)
Cc: Edzer Pebesma; sig-geo
Subject: Re: [R-sig-Geo] community support vs. corporate
Cathedrals were never based on grand design but on "ad hoc collective work"
(David Turnbull) and bazaar economies are all about hiding (price) information
(Clifford Geertz).
The Shinto shrine is indeed an improvement in metaphor, I guess.
Jacob van Etten
-Original Message-
From: r-sig
The case for a as.data.frame(signature=RasterStack) method (then you
would have three lines (one less than Kamran)
-Original Message-
From: r-sig-geo-boun...@stat.math.ethz.ch
[mailto:r-sig-geo-boun...@stat.math.ethz.ch] On Behalf Of Kamran Safi
Sent: Thursday, January 15, 2009 3:28 PM
To:
You could also look at "resistance distance" (open-source software available at
http://www.circuitscape.org/) if your fish travel as random-walkers.
Jacob van Etten
-Original Message-
From: r-sig-geo-boun...@stat.math.ethz.ch on behalf of Alisa Coffin
Sent: Fri 19/12/2008 04:16
To: Jon L
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