root [0] .x minimise.C TFile** spectrum.root TFile* spectrum.root KEY: TH1F hx2;1 x2 distribution 300 ********** ** 1 **SET ERR 1 ********** PARAMETER DEFINITIONS: NO. NAME VALUE STEP SIZE LIMITS 1 Constant 2.20000e+02 1.00000e-01 no limits 2 Mean 1.22000e+02 1.00000e-01 no limits 3 Sigma 2.86000e+01 1.00000e-01 no limits ********** ** 2 **MIGRAD 500 1 ********** FIRST CALL TO USER FUNCTION AT NEW START POINT, WITH IFLAG=4. START MIGRAD MINIMIZATION. STRATEGY 1. CONVERGENCE WHEN EDM .LT. 1.00e-03 FCN=inf FROM MIGRAD STATUS=INITIATE 107 CALLS 108 TOTAL EDM= unknown STRATEGY= 1 NO ERROR MATRIX EXT PARAMETER CURRENT GUESS STEP FIRST NO. NAME VALUE ERROR SIZE DERIVATIVE 1 Constant 2.20000e+02 1.00000e-01 0.00000e+00 -nan 2 Mean 1.22000e+02 1.00000e-01 0.00000e+00 -nan 3 Sigma 2.86000e+01 1.00000e-01 0.00000e+00 -nan MIGRAD FAILS TO FIND IMPROVEMENT MACHINE ACCURACY LIMITS FURTHER IMPROVEMENT. MIGRAD MINIMIZATION HAS CONVERGED. MIGRAD WILL VERIFY CONVERGENCE AND ERROR MATRIX. MINUIT WARNING IN HESSE ============== MATRIX FORCED POS-DEF BY ADDING -nan TO DIAGONAL. FCN=inf FROM MIGRAD STATUS=CONVERGED 164 CALLS 165 TOTAL EDM=-nan STRATEGY= 1 ERR MATRIX NOT POS-DEF EXT PARAMETER APPROXIMATE STEP FIRST NO. NAME VALUE ERROR SIZE DERIVATIVE 1 Constant 2.20000e+02 -nan 1.13552e+04 -nan 2 Mean 1.22000e+02 -nan 6.29696e+03 -nan 3 Sigma 2.86000e+01 nan 1.47617e+03 -nan EXTERNAL ERROR MATRIX. NDIM= 25 NPAR= 3 ERR DEF=1 nan nan nan nan nan nan nan nan -nan ERR MATRIX NOT POS-DEF PARAMETER CORRELATION COEFFICIENTS NO. GLOBAL 1 2 3 1 -nan nan nan nan 2 -nan nan nan nan 3 nan nan nan -nan ERR MATRIX NOT POS-DEF FCN=inf FROM MIGRAD STATUS=CONVERGED 164 CALLS 165 TOTAL EDM=-nan STRATEGY= 1 ERR MATRIX NOT POS-DEF EXT PARAMETER APPROXIMATE STEP FIRST NO. NAME VALUE ERROR SIZE DERIVATIVE 1 Constant 2.20000e+02 -nan 1.13552e+04 -nan 2 Mean 1.22000e+02 -nan 6.29696e+03 -nan 3 Sigma 2.86000e+01 nan 1.47617e+03 -nan Info in : created default TCanvas with name c1 root [1]