example2.cpp File Reference

Example application. More...

#include <time.h>
#include "GblUtilities.h"
#include "GblTrajectory.h"

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Functions
void	example2 ()

Detailed Description

Example application.

Author

Claus Kleinwort, DESY, 2011 (Claus.nosp@m..Kle.nosp@m.inwor.nosp@m.t@de.nosp@m.sy.de)

Copyright

Copyright (c) 2011 - 2023 Deutsches Elektronen-Synchroton, Member of the Helmholtz Association, (DESY), HAMBURG, GERMANY

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details.

You should have received a copy of the GNU Library General Public License along with this program (see the file COPYING.LIB for more details); if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

Definition in file example2.cpp.

Function Documentation

example2()

void example2

(

)

Simple technical example (measurement as local system).

Create points on initial trajectory, create trajectory from points, fit and write trajectory to MP-II binary file, get track parameter corrections and covariance matrix at points.

Equidistant measurement layers and thin scatterers, propagation with simple jacobian (quadratic in arc length differences). Measurement system as local coordinate system.

This example simulates and refits tracks in a system of planar detectors with 2D measurements in a constant magnet field in Z direction using measurement system as local system and (Q/P, slopes, offsets) as local track parameters. The true (curvilinear) track parameters are randomly smeared with respect to a (constant and straight) reference trajectory with direction (lambda, phi) and are used (only) for the on-the-fly simulation of the measurements and scatterers. The predictions from the reference trajectory are therefore always zero and the residuals needed (by addMeasurement) are equal to the measurements. The scatterers with have non diagonal precision matrices.

Definition at line 37 of file example2.cpp.

References gbl::GblPoint::addMeasurement(), gbl::GblPoint::addScatterer(), gbl::GblTrajectory::fit(), gbl::gblSimpleJacobian(), and gbl::unrm().