Changing coords in SpatialPolgyon
That fixed it! Thanks VERY much!! Thanks again, Nick
On 9/13/12 4:25 AM, Edzer Pebesma wrote:
Thanks, Nick. what works, and probably does what you want, is this: slot(all_emerged_islands_at_this_height_break at polygons[[1]]@Polygons[[1]], "coords", check=FALSE) = slot(tmppoly_shrunken, "coords") I replaced here all_emerged_islands_at_this_height_break[j] with all_emerged_islands_at_this_height_break selection-assignment replaces whole objects, not just its first element. As you address @polygons[[1]] you do make sure the replacement concerns the first element only. Your (somewhat understandable) assumption was that SpatialPolygons objects have a [<- method, but they don't (none of the Spatial* objects do). The error message "object of type 'S4' is not subsettable" is not very enlightening. I'll think of adding a [<- method that only gives an error message that is more helpful. Best regards, --
==================================================== Nicholas J. Matzke Ph.D. Candidate, Graduate Student Researcher Huelsenbeck Lab Center for Theoretical Evolutionary Genomics 4151 VLSB (Valley Life Sciences Building) Department of Integrative Biology University of California, Berkeley Graduate Student Instructor, IB200B Principles of Phylogenetics: Ecology and Evolution http://ib.berkeley.edu/courses/ib200b/ http://phylo.wikidot.com/ Lab websites: http://ib.berkeley.edu/people/lab_detail.php?lab=54 http://fisher.berkeley.edu/cteg/hlab.html Dept. personal page: http://ib.berkeley.edu/people/students/person_detail.php?person=370 Lab personal page: http://fisher.berkeley.edu/cteg/members/matzke.html Lab phone: 510-643-6299 Dept. fax: 510-643-6264 Cell phone: 510-301-0179 Email: matzke at berkeley.edu Mailing address: Department of Integrative Biology 1005 Valley Life Sciences Building #3140 Berkeley, CA 94720-3140 ----------------------------------------------------- "[W]hen people thought the earth was flat, they were wrong. When people thought the earth was spherical, they were wrong. But if you think that thinking the earth is spherical is just as wrong as thinking the earth is flat, then your view is wronger than both of them put together." Isaac Asimov (1989). "The Relativity of Wrong." The Skeptical Inquirer, 14(1), 35-44. Fall 1989. http://chem.tufts.edu/AnswersInScience/RelativityofWrong.htm