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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | R version 2.13.0 (2011-04-13)
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ISBN 3-900051-07-0
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> library(sp)
> xy = expand.grid(x = 1:4, y = 1:4)
> xy.sp = SpatialPoints(xy)
> gridded(xy.sp) = T
> # deselect 1 row and 2 col:
> tst = xy.sp[-c(2,6,10,14,9,11,12)]
> tst
Object of class SpatialPixels
Grid topology:
cellcentre.offset cellsize cells.dim
x 1 1 4
y 1 1 4
SpatialPoints:
x y
[1,] 1 1
[2,] 3 1
[3,] 4 1
[4,] 1 2
[5,] 3 2
[6,] 4 2
[7,] 1 4
[8,] 3 4
[9,] 4 4
Coordinate Reference System (CRS) arguments: NA
> # convert to SpatialPixelsDataFrame:
> tst = SpatialPixelsDataFrame(tst, data.frame(xx = rnorm(9)))
Warning messages:
1: In points2grid(points, tolerance, round) :
grid has empty column/rows in dimension 1
2: In points2grid(points, tolerance, round) :
grid has empty column/rows in dimension 2
> spplot(tst["xx"], main = "empty row + col")
>
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