>> Ouch.
> 
> Well I'm sure you know what the gradient is.  But how is it defined in 
> more than one dimension?  And the divergence function?  It's all taught 
> in vector calculus...

Try to remember: I have never taken any course in any mathematical 
subject of any description. I have a GCSE in mathematics (grade C), but 
that only covers addition, subtraction, multiplication, division and a 
few other bits and pieces. Everything else I know is what I have managed 
to figure out from reading books and surfing the net. ;-)

It's a wonder I know anything about mathematics at all... heh.

>> Wikipedia - a great reference source, a rubbish way to learn brand new 
>> concepts. (Indeed, I've seen articles marked for revision *because* 
>> "Wikipedia is not a how-to". Hmm, what *is* Wikipedia then?)
> 
> Wikipedia is a reference, not a website full of tutorials.  Still, they 
> should link at the bottom of the "vector calculus" page to some good 
> online tutorial as it's really not very hard if you have a basic 
> understanding of normal calculus.

I agree there.

Certainly the page on digital filters makes them seem like an utterly 
incomprehensible topic. But a short read of a good book reveals that 
it's all actually quite simple. [Assuming you want linear, 
time-invariant filters of course.]

Ah well, never mind.

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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