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From: M.J.Ratcliffe@bris.ac.uk
Subject: What is conjugate?
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What the bloody hell does 'conjugate' ACTUALLY MEAN? All the references 
that I can find say something useless such as: 'and from equation 1, it 
can clearly be seen that the new direction is conjugate, blah, blah...'. 
This sort of nonsense is not helpful. 

In a similar vein, does anybody have a really good explanation of 
Levenberg-Marquardt. Once again most references seem to be written in 
Ancient Greek; as far as I understand (which is not very far!) LM is a 
sort of blend between gradient descent and conjugate gradients, depending 
on some sort of confidence criterion.

Help!

Thanks 
Max


