[Halld-offline] NAN values for GetPull();

[Blake Leverington]

Thanks guys,

I'll have a look to make sure I'm passing in a proper error or 
covariance matrix and my vectors make sense. All the pull values return 
NAN. I didn't think anything had changed in the fitter code but I wasn't 
sure, so it's probably something I'm doing wrong. Thanks for the tips.

Cheers,
-Blake

On 08/03/10 07:06 PM, Matt wrote:
> Hi Curtis and Blake,
>
>   I'm not sure if this response will get bounced from the offline 
> mailing list. The mailer may not recognize this address.
>
>   The pulls are calculated as (x_init - x_final)/error, so NAN could 
> indicate err=0.0 for that particular fit. Could it be some odd error 
> matrix which is getting passed in? I might've thought it would've 
> blown up during the fit itself, but perhaps not.
>
>    Are other pulls (GetPull(1), GetPull(2), etc.) on the other fit 
> parameters NAN as well? Or are they looking OK?
>
> Matt
>
>
>
> On Mon, Mar 8, 2010 at 4:02 PM, Curtis A. Meyer 
> <cmeyer at ernest.phys.cmu.edu <mailto:cmeyer at ernest.phys.cmu.edu>> wrote:
>
>     Hi Blake -
>
>       we started playing with this again at CMU, but unfortunately the
>     code
>     has been orphaned since Matt Bellis left a couple of years ago. I
>     am a bit
>     surprised that it stopped working as I do  not believe that
>     anything in
>     the KINFIT
>     code has changed.
>
>       curtis
>
>     On 3/8/10 5:24 PM, Blake Leverington wrote:
>     > Hey all,
>     >
>     > Any ideas on why kfit->GetPull(0); in DKinFit returns NAN though
>     > kfit->Prob(); still returns reasonable values? I remember this
>     working
>     > months ago, put I can't get the pulls from the kinematic fitter
>     anymore,
>     > and I think I need to see this for my analysis at the moment.
>     >
>     > Who is maintaining the kinematic fitter now?
>     >
>     > -Blake
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>
>
>     --
>     Prof. Curtis A. Meyer           Department of Physics
>     Phone:  (412) 268-2745          Carnegie Mellon University
>     Fax:    (412) 681-0648          Pittsburgh PA 15213-3890
>     cmeyer at ernest.phys.cmu.edu <mailto:cmeyer at ernest.phys.cmu.edu>
>     http://www.curtismeyer.com/
>
>
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> -- 
> -- 
> ----------------------------
> Matt Bellis
> Stanford University
> (SLAC office)  650-926-4392
> (cell)    412-310-4586
> ----------------------------
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