For neuroscale outputs,
the hidden to output weights are determined using the iterative shadow
targets algorithm.
 Although this two stage
procedure may not give solutions with as low an error as using general 
purpose non-linear optimisers, it is much faster.

<p>The options vector may have two rows: if this is the case, then the second row
is passed to <CODE>rbfsetbf</CODE>, which allows the user to specify a different
number iterations for RBF and GMM training.
The optional parameters to <CODE>