>Cheers, Laurent.
This is under preparation. The HowtoFit will be introduced with
the beta release of version 1.0 in the coming few weeks.
Examples of fitting histograms with predefined formula or simple
one-line user functions can be seen in the tutorials
http://root.cern.ch/root/html/examples/fit1.C.html
and http://root.cern.ch/root/html/examples/multifit.C.html
Version 1.0 will include fits with arbitrary user defined functions.
This requires some changes in the CINT interpreter to speed-up
execution. We are also improving the user interface for the
class TMinuit.
Rene Brun