[R] A programming puzzler

[fharrell@virginia.edu]

Thanks to Robert Gentleman and Thomas Lumley who pointed
out the all.vars function does exactly what I need already.
-Frank Harrell
-- 
Frank E Harrell Jr              Prof. of Biostatistics & Statistics
Div. of Biostatistics & Epidem. Dept. of Health Evaluation Sciences
U. Virginia School of Medicine  http://hesweb1.med.virginia.edu/biostat
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