On Sun, 5 Mar 2006, Patrick Giraudoux wrote:
OK. Looks like I have got it... going through the source code of sp,
classes are declared as usual functions in *.R files. With the current
example, suppose I must write two files of names "class-Prior.R" and
"class-SamplePrior.R" including
setClass("Prior",representation(Distrib="character",Params="list")) and
setClass("SamplePrior",representation("Prior",Sample="list")) respectively.
Suppose the alphabetical order of each file name may be important
somehow, since "SamplePrior" cannot be defined without a prior
definition of "Prior"
Can anybody confirm?
Indeed. I suggest that you just use one file for all related classes and
methods. How R code in a package is divided amongst files is just a
matter of convenience for you, the maintainer. They will all be
concatenated before use. (The order is alphabetic in the C locale unless
you override it via the Collate: field in the DESCRIPTION file.)
If so, I can go on with validity checking functions...
Patrick
Patrick Giraudoux a écrit :
Dear listers,
I am making a trial to move from S3 to S4... I have created some
classes of interest and they work acceptably well for the purpose. I
am now wondering how to make them operate in a package. In clear when
a package is loaded (eg library(mypackage)) where should I put the
class descriptions:
setClass("Prior",representation(Distrib="character",Params="list"))
setClass("SamplePrior",representation("Prior",Sample="list"))
so that they are created and then usable for functions after a simple
call to library(mypackage).
It is probably something trivial, but I could not find out something
clear on this (eg example) in the R-help-list, writing R-extensions,
nor in S programming... and trying to get this info through reading
other library codes has been unsuccessful.
Patrick
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