[Halld-offline] recent change to tracking code

[Richard Jones]

Simon,

Igor showed me that the DKinFit class is still using the 7x7 error matrix as input.  Because of this, and because the 5x5 was heretofore in a non-standard representation, I implemented the 7x7 matrix into the REST model.  I save 30% in data volume if I can use your new 5x5 representation instead.  Do you have a standard method for massaging the new standard 5x5 matrix for presentation to DKinFit?

-Richard J.


On 7/9/2012 8:01 AM, Simon Taylor wrote:
> Hello, everyone.
>
> I have made the following change to the Kalman Filter code:  instead of
> providing 5x5 covariance matrices and 5x1 state vectors whose meaning
> depended on which parametrization was used in the fit, if the forward
> parametrization was used I have now rotate the 5x5 matrix and 5x1 state
> vector from this space into the central parametrization; in other words
> all the tracking results are now stored in DKinematicData using the
> state vector {q/pT,phi,tanl(lambda),D,z}.
>
> Simon
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