<<
I knew it wouldn't be perfect, but was
hoping for a closer approximation the next time I need to
figure out how big to make a Text 80 show up.
>>

I think R:Base is already making an "educated guess" at how wide the columns 
should be based on either the field size or the actual observed data in the 
first bunch of displayed rows.  It may be using the very same table-based 
algorithm as you are.

You could always simply scale the number that table produces to get a better 
fit for you.

I can write you up a little textextent utility as described in my previous 
email, but that will give you sizes based on the actual text you want to 
measure.  Would that help you?

BTW, it's 75px for dates!
--
Larry

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