[ROOT] Strange error message while fitting.

From: Sébastien Gadrat (gadrat@clermont.in2p3.fr)
Date: Thu May 13 2004 - 14:13:50 MEST 

Hi Rooters,

I get a strange error message when fitting some plots. Among information 
return by Minuit after the completion of the fit, I get "ERR MATRIX NOT 
POS-DEF" ! Can anyone know what does that mean ?
Here is the output I get :

 FCN=153.796 FROM MIGRAD    STATUS=CONVERGED      91 CALLS          92 TOTAL
                     EDM=2.47125e-08    STRATEGY= 1      ERR MATRIX NOT 
POS-DEF
  EXT PARAMETER                APPROXIMATE        STEP         FIRST
  NO.   NAME      VALUE            ERROR          SIZE      DERIVATIVE
   1  const0       5.72969e+03   7.36832e+01   4.07529e-01  -1.22906e-06
   2  const1      -8.46984e-01   7.65250e-03   3.44875e-06   7.87522e-02
   3  const3       9.15351e-02   7.21665e-03   1.82483e-05  -4.06709e-02
   4  slope1       2.19718e+00   6.64370e-03   2.93137e-06  -4.12211e-02
   5  slope2       2.08281e+00   6.22503e-03   2.84950e-06   4.62693e-02
   6  slope3       5.18135e-01   1.17508e-02   3.77755e-05   7.06570e-03

Thanks,
Regards,

Sebastien

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