[Lowq] DC calibration issues

[Hovanes Egiyan]

Hi Seema,

This can have significant effect.
What are the values in pmin and pmax arrays?
The initial parameters are close enough, the ratio of the first and 
fourth parameters should be same, 
the other parameters should start 
with the same values. Also I  am 
not sure if the number of parameters 
matters in these calls, but I would make them identical too.

I would suggest changing user_ana 
to match the calibration procedure source.

Hovanes



Sent from my iPhone

On Dec 5, 2010, at 5:01 PM, seema at jlab.org wrote:

> Hello Everyone,
> I have checked once again the fitting function used in dc3  and user_ana
> software. Although double gaussian is used in each case but the starting
> parameters are not allowed to vary freely in user_ana and that may be the
> reason for inconsistency in time residual means.
> 
> Functional form used in user_ana
> 
> call hfithn(hid,'G+G','QB',0,ggpar,step,pmin,pmax,eggpar,chi2)
> ggpar(1) = 50000
> ggpar(2) = 0.
> ggpar(3) = 0.02
> ggpar(4) = 10000
> ggpar(5) = 0.
> ggpar(6) = 0.1
> 
> Functional form used in dc3
> 
> hfithn(HID,"g+g","Q",6,PAR,STEP,PMIN,PMAX,SIGPAR,&CHISQ);
> 
> PAR[6] = {500.0, 0.0, 0.0300, 50.0, 0.0, 0.100}
> 
> Please notice the extra  'B' option selected in user_ana and also the
> starting parameters are different!
> 
> Best regards,
> Seema
> 
> 
>> Dear all,
>> 
>> due to various activities, Hall closing, PAC deadline and so on,
>> tomorrow's eg6 meeting is canceled.
>> 
>> Stepan
>> _______________________________________________
>> Lowq mailing list
>> Lowq at jlab.org
>> https://mailman.jlab.org/mailman/listinfo/lowq
>> 
> 
> 
> _______________________________________________
> Lowq mailing list
> Lowq at jlab.org
> https://mailman.jlab.org/mailman/listinfo/lowq