stefan kluth wrote: > > 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 > Hi Stefan, I cannot reproduce this problem. We provide a simple test program in $ROOTSYS/test/minexam. Could you put a print statement in the function fcnk0 of the example and tell me if you get what is expected. I have no problems with it. Rene Brun
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