Dear List: Sorry for posting maybe a trivial question, but I have a basic understanding problem. If I have say pack1 and pack2, two R packages, and pack2 depends on and imports pack1 fully (as in the code below), is there a way to make all the functionality of pack1 available for the global and other environments (not only for the functions called from withing pack2) by loading pack2 only? I thought if pack2 depends on and imports pack1 and essentially reexports everything, one should get the full functionality simply by loading pack2. This does not seem to be the case or I am missing something trivial in my NAMESPACE/DESCRIPTION files?
If this is documented in Writing R Extensions, I would be thankful for a page number and maybe a quick fix in my example below as so far I have not been able to find a clear explanation. The problem can be illustrated by the following simple example (this is a simple code for 2 packages, pack1 and pack2; plus an example). Thank you for your replies. Dr Oleg Sklyar Research Technologist AHL / Man Investments Ltd +44 (0)20 7144 3107 oskl...@maninvestments.com --- pack1: DESCRIPTION ------ Package: pack1 Version: 0.0.1 Date: 12 Jan 2009 Title: pack1 to test S3/S4 methods compatibility Author: Oleg Sklyar Depends: R (>= 2.7.1), methods Maintainer: Oleg Sklyar <oskl...@maninvestments.com> Description: pack1 LazyLoad: yes License: Proprietary URL: http://www.maninvestments.com LazyLoad: no --- pack1: NAMESPACE ------ import(methods) exportPattern("^[^\\.]") exportClasses(posixTime) exportMethods(as.POSIXct) --- pack1: posix.R ------ setClass("posixTime", "numeric") setGeneric("as.POSIXct") setMethod("as.POSIXct", signature(x="posixTime"), function(x, tz) { z = x...@.data attr(z,"class") = c("POSIXt", "POSIXct") attr(z,"tzone") = "UTC" z } ) testPosixVal = new("posixTime", as.numeric(Sys.time())) --- pack2: DESCRIPTION Package: pack2 Version: 0.0.1 Date: 12 Jan 2009 Title: pack2 to test S3/S4 methods compatibility Author: Oleg Sklyar Depends: R (>= 2.7.1), methods Maintainer: Oleg Sklyar <oskl...@maninvestments.com> Description: pack2 LazyLoad: yes License: Proprietary URL: http://www.maninvestments.com LazyLoad: no --- pack2: NAMESPACE ------ import(pack1) exportPattern("^[^\\.]") --- pack2: posix.R ------ testPosix = function() { z = as.POSIXct(testPosixVal) print(z) print(class(z)) z } ------ test code to run from global env, showing problems ------- require(pack2) ## use as.POSIXct imported into pack2 from pack1 to do the conversion in the fun testPosix() #~ [1] "2009-01-13 15:29:50 UTC" #~ [1] "POSIXt" "POSIXct" #~ [1] "2009-01-13 15:29:50 UTC" ## now try using it directly from the global env (pack1 was not explicitly loaded) as.POSIXct(pack1::testPosixVal) #~ Error in as.POSIXct.default(pack1::testPosixVal) : #~ do not know how to convert 'pack1::testPosixVal' to class "POSIXlt" ## now require pack1 explicitly and try again require(pack1) as.POSIXct(pack1::testPosixVal) #~ [1] "2009-01-13 15:29:50 UTC" ********************************************************************** Please consider the environment before printing this email or its attachments. The contents of this email are for the named addressees ...{{dropped:19}} ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
