Zero variance matrix components reported by adjust.exe when --report-results is run on phased-staged networks

[nicgowans]

Description

Zero variance matrix components are reported by adjust.exe in --report-results mode when a phased-staged adjustment is run. The effects are seen in:

• *.apu (zero variance matrix components, error ellipses, and -nan(ind) Hz PosU values)
• *.xyz (zero adjusted standard deviations for stations)
• *.adj (zero adjusted standard deviations for stations and measurements, and associated flow on into nstats, rigorous sigma zero, chi squared and pelzer)

Adjustments run in simultaneous or phased-multi modes are not affected.

DynAdjust version info

• Version: 1.2.7, Release (64-bit)
• Build: Mar 29 2023, 10:01:09 (MSVC++ 1935)

Steps to reproduce
To reproduce:

1. Run a network adjustment in phased-staged mode
2. Reproduce the adjustment results with adjust.exe using the following commands:

adjust.exe -n network_name --report-results --phased --staged --create-stage-files --purge-stage-files [etc]

3. Review *.apu, *.adj, *.xyz

Station                     Latitude      Longitude    Hz PosU    Vt PosU   Semi-major   Semi-minor  Orientation        Variance(X)        Variance(Y)        Variance(Z)
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
(1127a)_300559         -33.595529013  150.595927204  -nan(ind)     0.0000       0.0000       0.0000       0.0000    0.000000000e+00    0.000000000e+00    0.000000000e+00
                                                                                                                                       0.000000000e+00    0.000000000e+00
                                                                                                                                                          0.000000000e+00  

Expected behaviour
Variance matrix and associated uncertainties/statistics re-produced as per simultaneous and phased-multi modes

Station                     Latitude      Longitude    Hz PosU    Vt PosU   Semi-major   Semi-minor  Orientation        Variance(X)        Variance(Y)        Variance(Z)
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
(1127a)_300559         -33.595529013  150.595927204     0.0214     1.9408       0.0092       0.0083     118.1119    5.155713583e-01   -2.857467958e-01    3.975374830e-01
                                                                                                                                       1.584764161e-01   -2.203539908e-01
                                                                                                                                                          4.066365232e-01 

Screenshots
*.apu file:

*.adj file:

*.xyz file:

Operating system

• Windows 10