<[EMAIL PROTECTED]> writes:
> A more serious, philosophical word on Patrick's solution. It is
> rarely necessary (in my limited experience, sure) to have to use
> parse() like this. Where it provides a quick (kludgy?) solution I
> often find it a useful exercise to consider alternatives. They often
> come out simpler and you nearly always pick up something useful in
> the process.
Agreed. And the kludges (yes, they are) are prone to unexpected
behaviour if you try to use them generally. R's modelling code has
quite a few (not that I've counted them) constructs of the type
formula <- parse(paste("~", paste(terms, collapse="+")))
which breaks down horribly if one the terms has a nonstandard name
like `age in years`. Somewhere on my horizon is the task of hunting
down all of these and replace them with something independent of
textual representation.
--
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907
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