[Halld-offline] recent change to tracking code

[Richard Jones]

Simon,

Ok, great.  I will look for this method as soon as you check it in, and start using it.

-Richard J.


On 7/9/2012 10:09 AM, Simon Taylor wrote:
> Hi, Richard.
>
> For now I will implement a method in DKinFit that converts from the 5x5
> matrix to the 7x7 matrix.  In the future Paul and I are considering just
> using the 5x5 representation in DKinFit directly, but this is not ready
> to go yet.
>
> Simon
>
> On 07/09/2012 10:04 AM, Richard Jones wrote:
>> 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
>>> _______________________________________________
>>> Halld-offline mailing list
>>> Halld-offline at jlab.org
>>> https://mailman.jlab.org/mailman/listinfo/halld-offline
>>
>>



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