Hi George, Replace the line: gMinuit->mnemat(matrix,3); by gMinuit->mnemat(&matrix[0][0],3); Rene Brun On Mon, 27 May 2002, lobo wrote: > Hi rooters, > I have a problem since some days concerning Minuit in root. > I have written a small testfile to explain my problems. > // testfit.C > void testfit() { > > Double_t x1[] = {1000,16100,83000,223426,425938}; > Double_t y1[] = {0.0194932,0.00299029,0.00168717,0.00167152,0.00134782}; > Double_t ex1[] = {40,500,1000,1574.5,3062.5}; > Double_t ey1[] = > {0.00232989,0.000269625,0.000142085,0.000110943,7.1839e-05}; > TGraphErrors *fluxbkg = new TGraphErrors(5,x1,y1,ex1,ey1); > fluxbkg->Print(); > TF1 *fitFcn = new TF1("fitFcn",Background,0,450000,3); > fitFcn->SetParameters(0.,1.,-0.5.); > fitFcn->Draw(); > fluxbkg->Fit("fitFcn"); > double matrix[3][3]; > gMinuit->mnemat(matrix,3); > } > > Double_t Background(Double_t *x, Double_t *par) { > Double_t fitval = TMath::Power(x[0],par[2]); > return(par[0]+par[1]*fitval); > > > } > > When I load this file (.L testfit.C) and I execute it I got a segmentation > violation error after the fit. > > [root][1] .L testfit.C > [root][2] testfit(); > x[0]=1000, y[0]=0.0194932, ex[0]=40, ey[0]=0.00232989 > x[1]=16100, y[1]=0.00299029, ex[1]=500, ey[1]=0.000269625 > x[2]=83000, y[2]=0.00168717, ex[2]=1000, ey[2]=0.000142085 > x[3]=223426, y[3]=0.00167152, ex[3]=1574.5, ey[3]=0.000110943 > x[4]=425938, y[4]=0.00134782, ex[4]=3062.5, ey[4]=7.1839e-05 > <TCanvas::MakeDefCanvas>: created default TCanvas with name c1 > ********** > ** 1 **SET ERR 1 > ********** > ********** > ** 5 **MIGRAD 5000 5.539e-12 > ********** > MACHINE ACCURACY LIMITS FURTHER IMPROVEMENT. > MIGRAD MINIMIZATION HAS CONVERGED. > FCN=3.59539 FROM MIGRAD STATUS=CONVERGED 258 CALLS 259 > TOTAL > EDM=6.36245e-15 STRATEGY= 1 ERROR MATRIX > UNCERTAINTY > 1.6 per cent > EXT PARAMETER STEP FIRST > NO. NAME VALUE ERROR SIZE DERIVATIVE > 1 p0 1.30041e-03 8.98106e-05 -0.00000e+00 1.21824e-03 > 2 p1 6.12043e+00 3.81528e+00 0.00000e+00 -1.66377e-07 > 3 p2 -8.43509e-01 7.80422e-02 -0.00000e+00 -6.64307e-06 > FCN=3.59539 FROM MIGRAD STATUS=CONVERGED 258 CALLS 259 > TOTAL > EDM=6.36245e-15 STRATEGY= 1 ERROR MATRIX > UNCERTAINTY > 1.6 per cent > EXT PARAMETER STEP FIRST > NO. NAME VALUE ERROR SIZE DERIVATIVE > 1 p0 1.30041e-03 8.98106e-05 -0.00000e+00 1.21824e-03 > 2 p1 6.12043e+00 3.81528e+00 0.00000e+00 -1.66377e-07 > 3 p2 -8.43509e-01 7.80422e-02 -0.00000e+00 -6.64307e-06 > > *** Break *** segmentation violation > Root > Function testfit() busy flag cleared > > The starnge thing is if I type all the instruction one by one in the root > session I got no error, except it I don't type the line fitFcn->Draw(); > before. > > example if I type > ... > [root] TF1 *fitFcn = new TF1("fitFcn",Background,0,450000,3); > [root] fitFcn->SetParameters(0.,1.,-0.5.); > [root] fitFcn->Draw(); > [root] fluxbkg->Fit("fitFcn"); > .... > I have no no segvi error. > But if I type > > [root] TF1 *fitFcn = new TF1("fitFcn",Background,0,450000,3); > [root] fitFcn->SetParameters(0.,1.,-0.5.); > [root] fluxbkg->Fit("fitFcn"); > I got a > *** Break *** segmentation violation > > The other thing is about the mnemat call. When thing are working well I > got an error when retrieveing the matrix. > [root] double matrix[3][3]; > [root] gMinuit->mnemat(matrix,3); > > Error: Can't call TMinuit::mnemat(matrix,3) in current scope > FILE:/tmp/fileOCWcoy_cint LINE:1 > Possible candidates are... > filename line:size busy function type and name (in TMinuit) > (compiled) 0:0 0 public: virtual void mnemat(Double_t* > emat,Int_t ndim); > filename line:size busy function type and name (in TNamed) > filename line:size busy function type and name (in TObject) > *** Interpreter error recovered *** > > Could please someone tell me what is wrong ? I surely made a mistake but I > can't figure out which. > Thanks in advance. > > >
This archive was generated by hypermail 2b29 : Sat Jan 04 2003 - 23:50:54 MET