For geeks only:
I just rewrote my archaic (let's just call it a slide rule or maybe two tin cans with a string or maybe an abacus) Excel 2002+visual-basic Monte Carlo simulator -- but now in R. Was I surprised at the efficiency? No, not really. The gain in time for 5,000-10,000 runs? let's call it around 80%. I'll bet if I hired a programmer I could tamp that 80% down even more...but I'm not going to do that...cuz I'm cheap. And lazy. I've got 99% of what I need.
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