R help - Sep 2009 - is it possible: predict.lm on a matrix instead of a data.frame ?

Hello dear R-help members.

I need to run many "predict.lm" routines, and was hoping to have it
run
faster then it does now.
One way I was thinking about was to have it run on a matrix instead on a
data.frame (since in my situation a matrix will suffice).

Can someone suggest to me of ways to have predict.lm run faster, or
To have it run on a matrix? (I started breaking the code open, and found
many model.frame, and model.matrix which seems to need a data.frame to
work.)

Any hints will be welcomed.

Thanks,
Tal







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