Dear all,

I  ran into some issues that I've been trying to figure out for weeks but with no success. So I'm looking for some advice here. I've the following questions:

1. I want to write some S4 classes and methods and add them into a current package that was written in S3. Is this possible? Can both S3  and S4 methods exist in one package?
2. When I sourced my functions using "source", they work perfectly for all my testing examples. But if I put them into a package, build,  install and load this package, then surprisingly, some of the same testing code reports an error! But they are just the same functions except the fact that when I load the package, the previously existing S3 methods will also be loaded.  Is it possibly because of some conflicts between S3 and S4 since when I source it, only S4 methods are loaded?


This has been really confusing to me, and I really hope I could find some answers here. Many thanks in advance.



Wayne (Yanwei) Zhang
Statistical Research
CNA



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