UB matrix reported by configuration different than reported by pa()

[prjemian]

User reports

from configuration it shows. 'UB': [[1.609641549918, 0.071935335169, -0.010087451485], [0.008619451796, 0.033027313776, 1.610918145016], [0.072125960472, -1.609334294808, 0.032608920974]],

from pa, it says UB=[[1.6096, 0.0719, 0.0101], [0.0086, 0.033, 1.6109], [0.0721, -1.6093, 0.0326]]

notice that 0.0101 has different signs.

[prjemian]

In [41]: fourc.configuration
Out[41]: 
{'_header': {'datetime': '2025-12-16 13:11:34.406792',
  'hklpy2_version': '0.2.3',
  'python_class': 'Hklpy2Diffractometer'},
'name': 'e4cv',
'axes': {'pseudo_axes': ['h', 'k', 'l'],
  'real_axes': ['omega', 'chi', 'phi', 'tth'],
  'axes_xref': {'h': 'h',
   'k': 'k',
   'l': 'l',
   'omega': 'omega',
   'chi': 'chi',
   'phi': 'phi',
   'tth': 'tth'},
  'extra_axes': {'h2': 0, 'k2': 0, 'l2': 0, 'psi': 0}},
'digits': 4,
'sample_name': 's2',
'samples': {'sample': {'name': 'sample',
   'lattice': {'a': 1,
    'b': 1,
    'c': 1,
    'alpha': 90.0,
    'beta': 90.0,
    'gamma': 90.0,
    'digits': 4,
    'angle_units': 'degrees',
    'length_units': 'angstrom'},
   'reflections': {},
   'reflections_order': [],
   'U': [[1, 0, 0], [0, 1, 0], [0, 0, 1]],
   'UB': [[6.283185307179586, 0.0, 0.0],
    [0.0, 6.283185307179586, 0.0],
    [0.0, 0.0, 6.283185307179586]],
   'digits': 4},
  's2': {'name': 's2',
   'lattice': {'a': 3.8995,
    'b': 3.8995,
    'c': 3.8995,
    'alpha': 90,
    'beta': 90,
    'gamma': 90,
    'digits': 4,
    'angle_units': 'degrees',
    'length_units': 'angstrom'},
   'reflections': {'r_1b82': {'name': 'r_1b82',
     'geometry': 'E4CV',
     'pseudos': {'h': 0, 'k': 0, 'l': 1},
     'reals': {'omega': 39.177, 'chi': 88.826, 'phi': -2.465, 'tth': 78.971},
     'reals_units': 'angstrom',
     'wavelength': 4.9592,
     'wavelength_units': 'angstrom',
     'digits': 4},
    'r_ee52': {'name': 'r_ee52',
     'geometry': 'E4CV',
     'pseudos': {'h': 1, 'k': 0, 'l': 1},
     'reals': {'omega': 108.15, 'chi': 88.734, 'phi': -2.465, 'tth': 128.05},
     'reals_units': 'angstrom',
     'wavelength': 4.9592,
     'wavelength_units': 'angstrom',
     'digits': 4}},
   'reflections_order': ['r_1b82', 'r_ee52'],
   'U': [[0.99898330497, 0.044644845851, -0.006260521558],
    [0.00534944469, 0.020497566724, 0.99977559142],
    [0.044763152623, -0.998792614859, 0.020237901816]],
   'UB': [[1.609641549918, 0.071935335169, -0.010087451485],
    [0.008619451796, 0.033027313776, 1.610918145016],
    [0.072125960472, -1.609334294808, 0.032608920974]],
   'digits': 4}},
'constraints': {'omega': {'label': 'omega',
   'low_limit': -0.001,
   'high_limit': 180.0,
   'class': 'LimitsConstraint'},
  'chi': {'label': 'chi',
   'low_limit': -2.0,
   'high_limit': 100.0,
   'class': 'LimitsConstraint'},
  'phi': {'label': 'phi',
   'low_limit': 40.0,
   'high_limit': 41.0,
   'class': 'LimitsConstraint'},
  'tth': {'label': 'tth',
   'low_limit': -0.001,
   'high_limit': 180.0,
   'class': 'LimitsConstraint'}},
'solver': {'name': 'hkl_soleil',
  'description': "HklSolver(name='hkl_soleil', version='5.1.3', geometry='E4CV', engine_name='hkl', mode='constant_phi')",
  'geometry': 'E4CV',
  'real_axes': ['omega', 'chi', 'phi', 'tth'],
  'version': '5.1.3',
  'engine': 'hkl'},
'beam': {'class': 'WavelengthXray',
  'source_type': 'Synchrotron X-ray Source',
  'energy': 0.8532488933033981,
  'wavelength': 14.530836126673075,
  'energy_units': 'keV',
  'wavelength_units': 'angstrom'}}

[prjemian]

Further:

In [73]: wh()
wavelength=14.5308
pseudos: h=0.25, k=0.25, l=0.3799
reals: omega=117.116, chi=89.308, phi=42.532, tth=150.455
 
In [74]: fourc.inverse(tth=150.437, omega=117.116, chi=89.308, phi=42.526)
Out[74]: Hklpy2DiffractometerPseudoPos(h=0.25, k=0.25, l=0.3799)
 
In [75]: cahkl(0.25, 0.25, 0.3799)
Out[75]: Hklpy2DiffractometerRealPos(omega=117.1154, chi=89.3065, phi=42.532, tth=150.442)
 
In [76]: fourc.omega.move(40)
Out[76]: MoveStatus(done=True, pos=e4cv_omega, elapsed=0.0, success=True, settle_time=0.0)
 
In [77]: cahkl(0.25, 0.25, 0.3799)
Out[77]: 'No solutions.'

If I move motors to the target I got the solution. But if I move omega away then I got no solution.

[prjemian]

Also:

In [39]: pa()
diffractometer='e4cv'
HklSolver(name='hkl_soleil', version='5.1.3', geometry='E4CV', engine_name='hkl', mode='constant_phi')
Sample(name='s2', lattice=Lattice(a=3.8995, system='cubic'))
Reflection(name='r_1b82', h=0, k=0, l=1)
Reflection(name='r_ee52', h=1, k=0, l=1)
Orienting reflections: ['r_1b82', 'r_ee52']
U=[[0.999, 0.0446, 0.0063], [0.0053, 0.0205, 0.9998], [0.0448, 0.9988, 0.0202]]
UB=[[1.6096, 0.0719, 0.0101], [0.0086, 0.033, 1.6109], [0.0721, -1.6093, 0.0326]]
constraint: -0.001 <= omega <= 180.0
constraint: -2.0 <= chi <= 100.0
constraint: 40.0 <= phi <= 41.0
constraint: -0.001 <= tth <= 180.0
Mode: constant_phi
beam={'class': 'WavelengthXray', 'source_type': 'Synchrotron X-ray Source', 'energy': 0.8532, 'wavelength': 14.5308, 'energy_units': 'keV', 'wavelength_units': 'angstrom'}
pseudos: h=0, k=0, l=0
reals: omega=0, chi=0, phi=40, tth=0
 
In [40]: cahkl(0.25, 0.25, 2*3.8995/20.5311)
Out[40]: 'No solutions.'

[prjemian]

This problem (different UBs reported) has been reproduced in a new unit test.