R help - Mar 2012 - How to extend a slot of a class?

Hej hej,

is there a way to extend the SpatialPointsDataFrame data slot?This is the
structure of an object of it:> str(coord)
Formal class 'SpatialPointsDataFrame' [package "sp"] with 5
slots
  ..@ data       :'data.frame':	214 obs. of  2 variables:
  .. ..$ location.long: num [1:214] -79.8 -79.8 -79.8 -79.8 -79.8 ...
  .. ..$ location.lat : num [1:214] 9.16 9.16 9.16 9.16 9.16 ...
  ..@ coords.nrs : num(0) 
  ..@ coords     : num [1:214, 1:2] -79.8 -79.8 -79.8 -79.8 -79.8 ...
  .. ..- attr(*, "dimnames")=List of 2
  .. .. ..$ : NULL
  .. .. ..$ : chr [1:2] "location.long" "location.lat"
  ..@ bbox       : num [1:2, 1:2] -79.84 9.16 -79.84 9.17
  .. ..- attr(*, "dimnames")=List of 2
  .. .. ..$ : chr [1:2] "location.long" "location.lat"
  .. .. ..$ : chr [1:2] "min" "max"
  ..@ proj4string:Formal class 'CRS' [package "sp"] with 1
slots
  .. .. ..@ projargs: chr NA

data is a data.frame including the information of long and lat location. I would
like to have there a third information: time (but as POSIXct). Is there an
elegant way to do this?

Best,
marco
	[[alternative HTML version deleted]]

i think if you do:

coord$time<-YOURTIMEVECTOR

should work and the new vector is put correctly in the data slot.

Maybe also

coord at data$time<-YOURTIMEVECTOR

On Wed, Mar 14, 2012 at 01:39:20PM +0100, Marco Smolla
wrote:
> Hej hej,
> is there a way to extend the SpatialPointsDataFrame data slot?This is the
structure of an object of it:> str(coord)
> Formal class 'SpatialPointsDataFrame' [package "sp"] with
5 slots
>   ..@ data       :'data.frame':	214 obs. of  2 variables:
>   .. ..$ location.long: num [1:214] -79.8 -79.8 -79.8 -79.8 -79.8 ...
>   .. ..$ location.lat : num [1:214] 9.16 9.16 9.16 9.16 9.16 ...
>   ..@ coords.nrs : num(0) 
>   ..@ coords     : num [1:214, 1:2] -79.8 -79.8 -79.8 -79.8 -79.8 ...
>   .. ..- attr(*, "dimnames")=List of 2
>   .. .. ..$ : NULL
>   .. .. ..$ : chr [1:2] "location.long" "location.lat"
>   ..@ bbox       : num [1:2, 1:2] -79.84 9.16 -79.84 9.17
>   .. ..- attr(*, "dimnames")=List of 2
>   .. .. ..$ : chr [1:2] "location.long" "location.lat"
>   .. .. ..$ : chr [1:2] "min" "max"
>   ..@ proj4string:Formal class 'CRS' [package "sp"] with
1 slots
>   .. .. ..@ projargs: chr NA
> data is a data.frame including the information of long and lat location. I
would like to have there a third information: time (but as POSIXct). Is there an
elegant way to do this?
> Best,
> marco
> 	[[alternative HTML version deleted]]
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