R-alpha: Matrix Class

[Ross Ihaka]

The have been a few prods to create an S-like matrix class for R.  A
major reason for having a matrix class seems to be that people get
bitten by the default behavior of the drop= parameter to "[".  That
being the case does it make sense to change the semantics of "["
rather than introducing a new class?

I'm just wondering because I'm in a "smaller is better" kind of mood
after having been delving into the "lm" code and thinking about how
big R is becoming ...
	Ross
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