gbltst Namespace Reference

Classes
class	gblCurviSystem
	Curvilinear system as local system. More...
class	gblMeasSystem
	Measurement system as local system. More...

Functions
def	example1 ()
	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. More...
def	example2 ()
	Read trajectory from MP-II binary file and refit. More...
def	gblSimpleJacobian (ds, cosl, bfac)
	Simple jacobian. More...

Detailed Description

Simple Test Program for General Broken Lines.

Created on Jul 27, 2011

@author: kleinwrt

Function Documentation

example1()

def gbltst.example1

(

)

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). Curvilinear system (T,U,V) or measurement system (I,J,K) as local coordinate system and (q/p, slopes, offsets) as local track parameters.

This example simulates and refits tracks in a system of planar detectors with 2D measurements in a constant magnet field in Z direction using the curvilinear system as local system. The true 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.

Definition at line 55 of file gbltst.py.

References gblSimpleJacobian().

example2()

def gbltst.example2

(

)

Read trajectory from MP-II binary file and refit.

Definition at line 281 of file gbltst.py.

Referenced by gbltst.gblCurviSystem.getScatPrecision().

gblSimpleJacobian()

def gbltst.gblSimpleJacobian	(		ds,
			cosl,
			bfac
	)

Simple jacobian.

Simple jacobian for (q/p, slopes, offsets) in curvilinear system quadratic in arc length difference.

Parameters

ds	arc length difference; float
cosl	cos(lambda); float
bfac	Bz*c; float

Returns

jacobian to move by 'ds' on trajectory matrix(float)

Definition at line 328 of file gbltst.py.

Referenced by example1().