How to negate %in%
Sorry, I sent my initial reply only to Jim, not the list. Dan -------- Forwarded Message -------- From: Jim Burke <j.burke at earthlink.net> To: Dan Putler <dan.putler at sauder.ubc.ca> Subject: Re: [R-sig-Geo] How to negate %in% Date: Mon, 25 May 2009 14:01:26 -0500 Thanks Dan, Both yours and Torleif's suggestions work with a SpatialPolygonsDataFrame. It feels like Dan's suggestion works faster for my 1,897 polygons. Thanks again, Jim Burke
Dan Putler wrote:
Jim, A quick answer below. Dan On Mon, 2009-05-25 at 13:13 -0500, Jim Burke wrote:
I can subset a "SpatialPolygonsDataFrame" from a
data frame containing a smaller subset of IDs. For
example below.
smaller_sp <- large_sp [large_sp$ID %in% smaller_df$ID,]
smaller_sp <- large_sp [!(large_sp$ID %in% smaller_df$ID),]
Given the above how can I do the logically opposite from the %in% operation and get all those IDs not %in%? I am processing two different sets of polygons (A,B) in a loop. Operation is seeing in center points in polys B fall in A. I would like to remove the spatial polygons that I found (B) as I traverse the geographical area. Thanks, Jim Burke
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Dan Putler Sauder School of Business University of British Columbia