similar to: gpc.poly datatype

Dear R-helpers, thanks for yesterday's speeding-up tip. Here is my next query: I have lots of polygons (not necessarily convex ones, and they never have holes) given by x,y coordinates. I want to get the polygon that is the union of these polygons. This is my current method, but I am hoping there is a faster method (up to thousands of polygons, each with ca. 40 xy points). Example:

Hi. I've tried to create a polygon with one hole by gpclib using following example script. holepoly <- read.polyfile(system.file("poly-ex/hole-poly.txt", package ="gpclib"), nohole = FALSE) area.poly(holepoly) plot(holepoly,poly.args=list(col="red",border="blue")) And I noticed plot function couldn't draw polygons with holes correctly.

Hi all, I'm tring to download the gpclib library but I don't find it in the old repository install.packages(c("gpclib"), dependencies=TRUE, repos="http://cran.cnr.berkeley.edu/") Avviso in install.packages(c("gpclib"), dependencies = TRUE, repos = "http://cran.cnr.berkeley.edu/") : argument 'lib' is missing: using

Hello List! I asked this before (with no solution), but maybe this time... I'm trying to project a surface to the XY under a 3d cloud using lattice. I can project contour lines following the code for fig 13.7 in Deepayan Sarkar's "Lattice, Multivariate Data Visualization with R", but it fails when I try to "color them in" using panel.levelplot. ?utilities.3d says there

Hi everyone, ? I am trying to do a horizonplot using my own time series data. I know that there is a horizonplot function in latticeExtra, but on closer examination i think that the graph itself is slightly wrong (it displays some regions as triangles and i think they should be trapezoids, and the red regions (that are below the baseline) are displayed on top of the blue areas ? while i think

I have just uploaded a package to CRAN called `gpclib' for clipping large and complex polygons. This package provides an R interface to Alan Murta's very fast General Polygon Clipper library (written in C), which has an optimized version of the Vatti algorithm. Not all features of Murta's library are implemented -- right now you can do intersections, differences, and unions. There

I have just uploaded a package to CRAN called `gpclib' for clipping large and complex polygons. This package provides an R interface to Alan Murta's very fast General Polygon Clipper library (written in C), which has an optimized version of the Vatti algorithm. Not all features of Murta's library are implemented -- right now you can do intersections, differences, and unions. There

Hi, I have a tar.gz file. Using $tar -xzvf 'filename', I untarred the file. However, I found that the content is .PGC files (e.g. ISCCP.D2.0.GLOBAL.1983.07.99.0000.GPC ). I have tried to search for analysis of gpc data file in R. I have not been successful to get a good tip. I would be pleased if anybody could tell me if gpc analysis is implemented in R. Is there a program I must first

Dear R-helpers, an rgl-ers in particular, what is the easiest way to plot a section of a plane in 3D, that is given by the xyz coordinates of the outline? Suppose I have a polygon - which I know for sure is a set of coordinates on the same plane. One method I found is to use surf.tri from the geometry package, and then plot the triangles with rgl.triangles. This method is not perfect though,

I am not entirely sure what is going on. I am sure that I am missing something. maptools won't detach... Thanks for all of your help. R 2.11.1 OS Ubuntu 10.04 R --vanilla install.packages("sp", dep=TRUE) Loading required package: reshape Loading required package: plyr Loading required package: grid Loading required package: proto This is vegan 1.17-3 Loading required package:

Hi Folks, I have been using contour() to produce some contour plots (of a spatially-smooted density produced by kde2d()), with very satisfactory results. I now want access to the coordinates of the points on the contours, and it would seem that contour() does not return a value, so there is nothing from which these could be extracted. However, apparently contourLines() does, and it seems to be

Is possible to store the Group Policy Container (GPC) on a OpenLDAP? Is possible to store the Group Policy Template (GPT) on a Samba share? The idea is to manage windows desktop policies using the new Win200x GPOs without using an Active Directory. Any other hints? Thanks --------------------- Gabriel Acquistapace CaFeLUG (Capital Federal GNU/Linux User Group) Buenos Aires, Argentina

Hello everybody, I search a function which returns the contour of map with levels like contourLines, but I would like this function return the border of the map too, because the function contourLines cannot consider the corner of the map and it is not adapted to fill polygon after that. Thanks in advance Pierre Bruyer

Greetings all! I'm wanting to plot contours of a function, and I don't want to evaluate it at a dense grid of points (i.e. I don't want a huge array of values). Say I have a vector of x-values such as x <- 0.1*c(1:10), and the same for y <- 0.1*(0:10). I then evaluate a 10*10 matrix z of values of z = f(x,y). so I can then do CL <- contourLines(x,y,z) and get a list of

A follow-up to my previous query. Say one of the results returned by contourLines() is C.W <- contourLines(....) Then C.W is a list of (in this case 28) lists, each of which is a list with components $level (a single number), $x (the x coords of the points on a contour at that level) and $y (the y coords). I can of course get these individually with, for the 5th one for instance,

I am using contour to draw contour lines onto a photo (jpeg) of a leaf on a white background. I have two problems: 1) The contour gets plotted at right angles to the jpeg image. I guess this is a problem of referencing the start and end points of the image matrix but I can't see how to over come this other than loading in a second image that has been rotated 90 degrees and plotting the

In Germany the Unemployment Agency uses a sectioning of the german map that is different from the usual Administrative Boundaries. Some demographic data are available in Administrative Boundaries only, some in Unemployment Boundaries only. I would like to generate estimates in one boundary system of data availabe in the other boundary system, and would appreciate advice concerning the following

Hi all, I am trying to test the new adehabitat package but I have a problem with a linked library, "gpclib". When I try do install it I have this output: install.packages("gpclib", dependencies=TRUE, repos="http://cran.cnr.berkeley.edu/") Avviso in install.packages("gpclib", dependencies = TRUE, repos = "http://cran.cnr.berkeley.edu/") : argument

https://bugs.freedesktop.org/show_bug.cgi?id=66650 Priority: medium Bug ID: 66650 Assignee: nouveau at lists.freedesktop.org Summary: [regression][NVD0] 'drm/nve0-/gr: some new gpc registers can have multiple copies' causes lockups QA Contact: xorg-team at lists.x.org Severity: normal Classification:

Dear useRs, I'm trying to simply fill in the area under a curve using RGL. Here' the set up: x <- c(0.75,75.75,150.75,225.75,300.75,375.75,450.75,525.75,600.75,675.75, 0.5,50.5,100.5,150.5,200.5,250.5,300.5,350.5,400.5,450.5, 0.25,25.25,50.25,75.25,100.25,125.25,150.25,175.25,200.25,225.25) y <- c(0.05,4.91,9.78,14.64,19.51,24.38,29.24,34.11,38.97,43.84,