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I have attached the new files and all modifications done by Mihaela to
include the new shape TGeoXtru representing the old TXTRU shape.
Currently she implemented the Contains() method. The shape can be also
visualized in the pad or x3d (see atached macro). The only limitation in
x3d is that the end-polygons are not decomposed into convex polygons, so
in case the section of the TGeoXtru is concave the drawing is not well
handled.
  I also included a minor modification in TGeoManager.h needed by FLUKA
(that now can perform tracking and completers gAlice->Run() with TGeo!!!)


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of the chisquare (based on original code by Andy Haas)


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In Graph2D:

- A more complete example (fitting)
- Constructor from a file name
- New method Interpolate
- New method FindObject
- Fitting
- New method GetHistogram.
- New method RemovePoint
- New methods SetMaximum and SetMinimum
- plus many improvements ...

In TFitter:

- Necessary changes to support Graph2D fitting


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(thanks Paul Balm)


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instead of the array "xx" for the two points surrounding the main point.
In case of a CINT function, one should have initialized again teh address of
the arguments, but this is not necessary. The array "x" may be reused inside the loop.
The effect was a slightly different result between compiled and interpreted code
in case of TGraph. (thanks Alex Conley for reporting the problem)


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Changes in the Minuit documentation to use "Begin_Html/End_Html" in a consistent way.


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  Double_t GetParError(Int_t ipar) const
in TVirtualFitter, TFitter and TFumili
Declare const the GetParameter function introduced recently.


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to the abstract interface TVirtualFitter and to the concrete
implementations TFitter and TFumili.


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changed during the fit procedure (or deletedIn TMinuit::setFCN one musr recompute gMinuit in case gMinuit was
changed during the fit procedure (or deleted)


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(thanks Mike Kordoski)


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The default constructor has been modified to correctly preset all
the pointers and initialize the structures only in case
TClass is not in read mode.
TMinuit.h has been modified with new data members used to indicate
the length of Minuit arrays.


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when linking statically


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these libs are build before libFumili and libMinuit.


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The objective functions H1FitChisquare and H1FitLikelihood previously in TH1
or TGraph have been moved to TFitter.
The global variables communicating with TH1 or TGraph have been replaced
by the functions in TVirtualFitter.


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GetMethodCall()
GetObjectFit
GetMaxIterations
GetNumFixedPars
GetNumFreePars
GetNumPars
GetParameter
GetPlot
GetStatus
mnpout


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  Bool_t fGraphicsMode;
  TObject *fPlot;

By default fGraphicsMode is true.
When calling the Minuit functions such as mncont, mnscan, or any Minuit
command invoking mnplot, TMinuit::mnplot produces a TGraph object
pointed by TObject *fPlot.
One can retrieve this object with TMinuit::GetPlot();
For example, one can do:
  h->Fit("gaus");
  gMinuit->Command("SCAn 1");
  TGraph *gr = (TGraph*)gMinuit->GetPlot();
  gr->setMarkerStyle(21);
  gr->Draw("alp");

To set Minuit in no graphics mode, call gMinuit->SetGraphicsMode(kFALSE);


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TMinuit::mnstats


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manager can be used in more places, this is coming.


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by default with 25 parameters.


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This is required by gcc on MacOS X


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Int_t  Eval(Int_t &npar, Double_t *grad, Double_t &fval, Double_t *par, Int_t flag)
to
Int_t  Eval(Int_t npar, Double_t *grad, Double_t &fval, Double_t *par, Int_t flag)

such that npar is always an input parameter. This has required a modification
of TMinuit::mnline.


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Int_t TMinuit::Eval(Int_t &npar, Double_t *grad, Double_t &fval, Double_t *par, Int_t flag)
// Evaluate the minimisation function
//  Input parameters:
//    npar:    number of currently variable parameters
//    par:     array of (constant and variable) parameters
//    flag:    Indicates what is to be calculated (see example below)
//    grad:    array of gradients
//  Output parameters:
//    fval:    The calculated function value.
//    grad:    The (optional) vector of first derivatives).
//
// The meaning of the parameters par is of course defined by the user,
// who uses the values of those parameters to calculate his function value.
// The starting values must be specified by the user.
// Later values are determined by Minuit as it searches for the minimum
// or performs whatever analysis is requested by the user.
//
// Note that this virtual function may be redefined in a class derived from TMinuit.
// The default function calls the function specified in SetFCN
//
// Example of Minimisation function:
/*
   if (flag == 1) {
      read input data,
      calculate any necessary constants, etc.
   }
   if (flag == 2) {
      calculate GRAD, the first derivatives of FVAL
     (this is optional)
   }
   Always calculate the value of the function, FVAL,
   which is usually a chisquare or log likelihood.
   if (iflag == 3) {
      will come here only after the fit is finished.
      Perform any final calculations, output fitted data, etc.
   }
*/
//  See concrete examples in TH1::H1FitChisquare, H1FitLikelihood


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mnfree(1) frees only the last fixed parameters. The change takes care
of multiple fixed parameters.
Also small change in print format for parameters between boundaries.
Thanks to Marco van Leeuwen.


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