How to negate %in%

Hi All,

Everyone's suggestions work. There are lots
of roads to solutions in R. This is wonderful!

It seems that Dan's and Pedro's solutions
work faster for my largish 1,897 spatial
polygon data frame.

Thanks,
Jim Burke

All replies are below.

=================================================
Hi This (!) might work:
aa <- 1:10
bb <- 5:6
aa[!aa %in% bb]     ## Yes it works
[1]  1  2  3  4  7  8  9 10
aa[aa %in% bb]
[1] 5 6
Best wishes
Torleif Markussen

===================================================
smaller_sp <- large_sp [!(large_sp$ID %in% smaller_df$ID),]
Dan Pulter

====================================================
smaller_sp <- large_sp [large_sp$ID %in% smaller_df$ID == FALSE,]
Pedro Mardones

Hi 

This (!) might work:

aa <- 1:10
bb <- 5:6

aa[!aa %in% bb]
[1]  1  2  3  4  7  8  9 10

aa[aa %in% bb]
[1] 5 6

Best wishes
Torleif


On Monday 25 May 2009 08:13:40 pm 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,]

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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