Home » PANDA » PandaRoot » Tracking » LSLTrackrep covariances are zero
| Re: LSLTrackrep covariances are zero [message #8544 is a reply to message #8542] |
Wed, 13 May 2009 15:14   |
asanchez
Messages: 350
Registered: March 2006
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first-grade participant |
From: *gsi.de
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Dear Christian,
i have checked it now the modifications.
And it works fine, but i see something strange, maybe you can tell
me what is the reason?
I show you that with an example:
that is the output of the LSLtrackrep as it comes from
the initialization(DemoPatternRecoTask.cxx)
PndHypDPatternRecoTask::Exec
<<<<< Event 44 <<<
particle -211
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
AbsTrackRep::Parameters at reference plane DetPlane: O(0.344825,1.1159,-76.427) u(1,0,0) v(0,1,0) n(0,0,1)
AbsTrackRep::State
5x1 matrix is as follows
| 0 |
------------------
0 | 0.3448
1 | 1.116
2 | -1.309
3 | 1.916
4 | -7.383
AbsTrackRep::Covariances
5x5 matrix is as follows
| 0 | 1 | 2 | 3 | 4 |
----------------------------------------------------------------------
0 | 0.01 0 0 0 0
1 | 0 0.01 0 0 0
2 | 0 0 0.1 0 0
3 | 0 0 0 0.1 0
4 | 0 0 0 0 0.1
AbsTrackRep::chi^2
0
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
And that is the output of the Kalman task,
PndHypDKalmanTask::Exec Event 44
18 hits in track 0
| Quote: |
SUCESSFULL FIT!
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
AbsTrackRep::Parameters at reference plane DetPlane: O(0.33394,1.14308,-76.4169) u(0.707099,0.707099,0.00478064) v(0.70689,-0.706688,-0.0299813) n(-0.0178213,0.0245791,-0.999539)
AbsTrackRep::State
5x1 matrix is as follows
| 0 |
------------------
0 | 0.7668
1 | -0.971
2 | -1.362
3 | 1.879
4 | -7.383
AbsTrackRep::Covariances
5x5 matrix is as follows
| 0 | 1 | 2 | 3 | 4 |
----------------------------------------------------------------------
0 | 0.02639 -2.799e-19 0 0 0
1 | -2.799e-19 0.02639 0 0 0
2 | 0 0 3.2e+05 0 0
3 | 0 0 0 3.2e+05 0
4 | 0 0 0 0 3.2e+05
AbsTrackRep::chi^2
20.5819
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
momentum 0.13544
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So my question is related to the fact that the diagonal elements
(red marked ones) of the cov matrix changes a little bit or nothing,
and i would expect that the asymmtric elements of the matrix were not zero.
Do you any idea, why ?
thanks a lot in advance
ALicia S.
-
Attachment: covEle.txt
(Size: 2.63KB, Downloaded 256 times)
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