On 24.08.2011 10:30, Jonathan Greenberg wrote:
R-helpers:
I'm trying to build a package, but I'm a bit new to the whole S3/S4
methods concept. I'm trying to add a new definition of the zoo
function "as.yearmon", but I'm getting the following error when it
gets to this point during a package install:
Thhis seesm more appropiate for the R-devel rather than the R-help list.
Anyway, see below.
***
R CMD INSTALL STARStools
* installing to library
‘/Library/Frameworks/R.framework/Versions/2.13/Resources/library’
WARNING: omitting pointless dependence on 'R' without a version requirement
* installing *source* package ‘STARStools’ ...
** R
** inst
** preparing package for lazy loading
Loading required package: sp
raster version 1.9-5 (28-July-2011)
Geospatial Data Abstraction Library extensions to R successfully loaded
Loaded GDAL runtime: GDAL 1.8.0, released 2011/01/12
Path to GDAL shared files:
/Library/Frameworks/GDAL.framework/Versions/1.8/Resources/gdal
Loaded PROJ.4 runtime: Rel. 4.7.1, 23 September 2009
Path to PROJ.4 shared files: (autodetected)
Attaching package: 'zoo'
The following object(s) are masked from 'package:base':
as.Date
Creating a new generic function for "as.Date" in "STARStools"
Creating a new generic function for "as.list" in "STARStools"
Error in setGeneric(f, where = where) :
must supply a function skeleton, explicitly or via an existing function
Error : unable to load R code in package 'STARStools'
ERROR: lazy loading failed for package ‘STARStools’
* removing
‘/Library/Frameworks/R.framework/Versions/2.13/Resources/library/STARStools’
* restoring previous
‘/Library/Frameworks/R.framework/Versions/2.13/Resources/library/STARStools’
***
# Note that these "require" statements do not appear in the code, but
appear in the DESCRIPTION file:
require("sp")
require("zoo")
??? Not valid in the DESCRIPTION file. Either use this in your code or
import from the corresponding Namespaces which you will have to do
anyway for the next R release.
# Here are the class definitions (filename AAAclassdefinitions.R):
setClass("SpatialPointsDataFrameList",representation(list="list"),contains=c("SpatialPointsDataFrame"))
setClass("SpatialPointsDataFrameListZoo",contains=c("SpatialPointsDataFrameList"))
# And here is where it is getting hung up. filename
"as.yearmon.SpatialPointsDataFrameListZoo_SpatialPointsDataFrameListZoo.R"
setMethod("as.yearmon",
signature(x = "SpatialPointsDataFrameListZoo"),
as.yearmon.SpatialPointsDataFrameListZoo
)
You try to register the method pointing to a function definition that
does not exist at this point (since you define it below). Just move the
definition up.
Uwe Ligges
# Filename "as.yearmon.SpatialPointsDataFrameListZoo.R"
as.yearmon.SpatialPointsDataFrameListZoo=function(x,...)
{
newlist=mapply(zoo:::as.yearmon,x@list,MoreArgs=list(...),simplify=FALSE)
x@list=newlist
return(x)
}
Thoughts?
--j
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