Hi,
with root 2.20/06 I find that in
void fcn( Int_t &npar, Double_t *gin, Double_t &f,
Double_t *par, Int_t iflag) {
// my fit code
}
which is called by MINUIT through TMinuit the parameter iflag is not
passed correctly. Even calling fcn explicitly with
...
arglist[0]= 4;
gMinuit->mnexcm( "CALL", arglist, 1, ierflg );
...
I get nonsense (i.e something like iflag= 6585878) for iflag in fcn. This
is bad, because traditionally in MINUIT style fits one has if-blocks in
the fcn function which test the value of iflag to initialise, calculate
the fit function or do some final calculation after the fit is done. At
the moment, I have a workaround by using an extra constant fit parameter
to pass a value for iflag, but this is quite ugly.
cheers, Stefan
---Stefan Kluth---------------Lynen Fellow----------------|\--|\-------
- LBNL, MS 50A 2160 - phone: +1 510 495 2376 - |/ |/ -
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---Berkeley, CA94720, USA-----e-mail: SKluth@lbl.gov------|/\/|/\/|----
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