Brian Ripley stated that in the future it will not be a good idea to
have top-level code in R packages other than assignments. There is one
important exception, though it leads instantly to an assignment. To
maintain compatibility across multiple platforms (R, S-Plus, and more
than one version of each, Windows, Linux, etc.) I frequently use if( )
statements to conditionally define functions depending on the operating
system and the version of R or S-Plus in effect.
Frank
--
Frank E Harrell Jr Professor and Chair School of Medicine
Department of Biostatistics Vanderbilt University
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