Hi Drew,
You can access all TMinuit members (they are public) after the fit
root > hist.Fit("gaus");
root > gMinuit->fStatus
root > gMinuit->fCstatu
Rene Brun
Drew Alton wrote:
>
> Hello,
> I am doing fits in Root. When I do them interactively I see something
> like this:
> FCN=1.26222e-15 FROM MINOS STATUS=SUCCESSFUL 3927 CALLS 4804
> TOTAL
> EDM=2.52464e-15 STRATEGY= 1 ERROR MATRIX
> ACCURATE
> EXT PARAMETER PARABOLIC MINOS ERRORS
> NO. NAME VALUE ERROR NEGATIVE POSITIVE
> 1 p0 2.06813e-01 7.75185e-02 -6.69639e-02 8.88198e-02
> 2 p1 7.93187e-01 7.86323e-02 -8.98656e-02 6.83877e-02
> 3 p2 6.99663e-01 1.64727e-01 -1.58526e-01 1.73633e-01
> 4 p3 3.00337e-01 1.86156e-01 -1.93731e-01 1.85260e-01
> 5 p4 7.35839e-01 1.21140e-01 -1.08260e-01 1.40031e-01
> 6 p5 1.16457e-01 3.56975e-02 -3.99971e-02 3.22014e-02
> 7 p6 6.41985e-01 9.11096e-02 -8.25384e-02 1.01704e-01
> 8 p7 1.50805e-01 3.03124e-02 -3.35608e-02 2.75935e-02
>
> The top line says STATUS=SUCCESSFUL, however sometimes I have FAILED
> or PROBLEMS. I assume there is some way to get this information but
> I cant find any access methods that sound right.
>
> I am basically defining a histogram and then a fit fuction and then
> I do:
> histo->Fit("System8","rnem");
>
> I figured out how to get the parameters, the errors, the chi2, but
> the success/failed flag escapes me.
>
> Anyone know how to get this information?
> -Drew
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