API documentation?
Dear David, Probably the best way to start is by checking the HTML documentation. It should be installed locally but it is also accesible, for example, here: http://finzi.psych.upenn.edu/R/library/sp/html/00Index.html Hope this helps. Virgilio
On Mon, 2008-06-30 at 18:48 +0200, David Hugh-Jones wrote:
Thanks David for his comment about dp. Quick question: is there any reasonably comprehensible API documentation for the "sp" package? I have just spent about an hour trying to get a list of points from a SpatialPolygons object. I eventually just printed everything out and found the data by hand, so now I am doing: coords <- myobject at polygons[[1]]@Polygons[[1]]@coords but I don't assume that is right. Surely there must be some simple way to get a list of x and y coords out of any object? in frustration, David Hugh-Jones PhD Candidate Essex University Department of Government http://davidhughjones.googlepages.com 2008/6/30 David PINAUD <pinaud at cebc.cnrs.fr>:
maybe you can try the function dp() in the package "shapefiles", which is an implementation of the Douglas-Peucker polyLine simplification algorithm. Hope it helps David David Hugh-Jones a ?crit :
Hi all I have a big dataset of points and am doing stuff on them that takes a lot of time. To speed it up, I would like to use "thinlines" from RArcinfo, which basically makes the maps "rougher" by throwing away points. Is there an equivalent function for SpatialPolygon type objects? (I assume that there's no way to convert _to_ Arcinfo, though I know it's possible to read from it). Cheers David Hugh-Jones PhD Candidate Essex University Department of Government http://davidhughjones.googlepages.com
_______________________________________________ R-sig-Geo mailing list R-sig-Geo at stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
-- *************************************************** David PINAUD Ing?nieur de Recherche "Analyses spatiales" Centre d'Etudes Biologiques de Chiz? - CNRS UPR1934 79360 Villiers-en-Bois, France poste 485 Tel: +33 (0)5.49.09.35.58 Fax: +33 (0)5.49.09.65.26 http://www.cebc.cnrs.fr/ *************************************************** ________ Information from NOD32 ________ This message was checked by NOD32 Antivirus System for Linux Mail Servers. http://www.eset.com
_______________________________________________ R-sig-Geo mailing list R-sig-Geo at stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo