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Hi Will,<br>
<br>
I just committed a change to the repository (revision 7169) to
implement reconstituting the tracking error matrices when reading in
DTrackTimeBased objects from an HDDM file. This did not require any
change to the danahddm plugin nor the data model so you should be
able to use it with your existing data files containing
DTrackTimeBased objects.<br>
<br>
The one odd thing I saw was that when just doing a "Print" of
the matrices when fully reconstructed as opposed to the objects
being read from a file, the 5x5 TrackingErrorMatrix had zeros in the
lower-left diagnal. This was not the case for objects that were read
from the file since it explicitly sets both [x][y] and [y][x]
elements to be the same when it reads them in. What is odd is that
these are typedef'd as root TMatrixDSym objects which are supposed
to be symmetric. The documentation even says that when you set one
element, the corresponding one is updated. This does not appear to
be the case.<br>
<br>
At any rate, analyses will use the 7x7 "errorMatrix" which is
the same in both cases.<br>
<br>
Let me know if you have any trouble.<br>
<br>
Regards,<br>
-Dave<br>
<br>
On 12/17/10 4:43 PM, Will Levine wrote:
<blockquote
cite="mid:AANLkTinPd2P7XACY09JFoZwizL2JOVt2Ly87Dd=YcEa-@mail.gmail.com"
type="cite">
<pre wrap="">Hi,
When I run danahddm with the Kalman fitter, the 4-momenta seem to be
stored okay, but I can't get any error matrices for charged tracks
from the resulting dana_events.hddm file. Is there any way to get
around this?
Thanks,
Will
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