Interesting article -- I've done quite a lot of d.p. and analysis in my time but I think you've introduced the topic very well.

>>I've also got a fair bit on using trigonometry to work out positional

>> geography i.e. where your stores are in relation to each other and your

>> customers.

>>Depending on how the this article is received I may write these up from

>>the database angle.

I'ld certainly be interested to read that.