[R-sig-Geo] wish: transparent remove.duplicates on non-duplicated sp objects

[edzer pebesma]

Yes, thanks. Will do this.

"Víctor Homar Santaner" <victor.homar at uib.cat> wrote:

>Hi and thanks to all R developers and helpers,>
>>
>I'm writing a few words of code to perform automatic ordinary krigings for a number of dates. In my dataset some duplicated locations exist (at the resolution of the coordinates I use) for some days. Thus, I run the straight-forward solution of using the "remove.duplicates" and the process works well.>
>>
>The problem is when the loop applies "remove.duplicates" for an object with no duplicates. The output of this command is not the original object but an empty one:>
>>
>> str(Pst)>
>Formal class 'SpatialPointsDataFrame' [package "sp"] with 5 slots>
>  ..@ data       :'data.frame':	177 obs. of  1 variable:>
>  .. ..$ PCP: num [1:177] 0 0 0 0 0 0 1.2 0.6 0 0 ...>
>  ..@ coords.nrs : num(0) >
>  ..@ coords     : num [1:177, 1:2] 518 494 490 489 490 ...>
>  .. ..- attr(*, "dimnames")=List of 2>
>  .. .. ..$ : chr [1:177] "B001" "B007" "B013" "B014" ...>
>  .. .. ..$ : chr [1:2] "X(km)" "Y(km)">
>  ..@ bbox       : num [1:2, 1:2] 345 4280 612 4438>
>  .. ..- attr(*, "dimnames")=List of 2>
>  .. .. ..$ : chr [1:2] "X(km)" "Y(km)">
>  .. .. ..$ : chr [1:2] "min" "max">
>  ..@ proj4string:Formal class 'CRS' [package "sp"] with 1 slots>
>  .. .. ..@ projargs: chr "+proj=utm +zone=31 +units=km">
>>
>> remove.duplicates(Pst)>
>[1] coordinates PCP        >
><0 rows> (or 0-length row.names)>
>Warning messages:>
>1: In min(x) : no non-missing arguments to min; returning Inf>
>2: In max(x) : no non-missing arguments to max; returning -Inf>
>3: In min(x) : no non-missing arguments to min; returning Inf>
>4: In max(x) : no non-missing arguments to max; returning -Inf>
>>
>Wouldn't it be nice if "remove.duplicates" left objects with no duplicates unmodified?>
>>
>>
>Thanks,>
>>
>V�ctor.>
>-->
>-------------------------------------------------------------------->
>V�ctor Homar Santaner>
>Grup de Meteorologia			Departament de F�sica>
>Edif. Mateu Orfila                      Tel: +34 971 17 2505>
>Universitat de les Illes Balears        Fax: +34 971 17 3426>
>07122 Palma de Mallorca (SPAIN)         Email: Victor.Homar at uib.es>
>>
>                Knowledge is contagious. Infect truth.>
>-------------------------------------------------------------------->
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