Tim Hesterberg of MathSoft has done a little bit of testing of the following
on S-Plus 5.x and it seems to work. That leads to a change to existing
code so that one version will work both in 5.x and in versions before 5.0:
Old Coding New Coding
k <- class(x) k <- attr(x, 'class')
class(x) <- k attr(x, 'class') <- k
w <- value; class(w) <- 'myclass'
w <- structure(value, class='myclass')
The last form is particularly handy for returning objects in functions.
The new approach gets around the non-backward compatibility of
class() in 5.x without resorting to the somewhat distasteful oldClass().
Unless someone sees a problem with this, I plan to use the above new
coding in making changes in my libraries so that they will be compatible with
5.x.
Please don't blame Tim if there is a problem with this because neither he nor
MathSoft endorse it - Tim just let me know that it appears to work.
---------------------------------------------------------------------------
Frank E Harrell Jr
Professor of Biostatistics and Statistics
Director, Division of Biostatistics and Epidemiology
Dept of Health Evaluation Sciences
University of Virginia School of Medicine
http://hesweb1.med.virginia.edu/biostat
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