Function interface for Least-Squares Fitting

[Brian Gough]

Jari Häkkinen writes:
 > Yes, of course, I am doing it my copy of the gsl CVS (in cvs_fit.h) but 
 > would like to see it the official release. Why was it decided against 
 > having gsl_vectors in the interface.

This is to avoid having additional dependencies or two versions of
every function---where possible, the plain C interface is preferred.
See the GSL Design document for more explanation.

-- 
best regards

Brian Gough

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