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Oscillating iterations #331

@daleroberts

Description

@daleroberts

DynAdjust can sometimes oscillate or flip/flop when solving iterations and never converge.

+---------------------------------------------------------------------------
     + Title:        dnaadjust - DynAdjust 2025.
     + Description:  Geodetic network adjustment software
     + Version:      1.2.9, Release with Apple Accelerate Framework
     + Build:        Feb 19 2026, 15:14:20 - Clang Apple LLVM 17.0.0 (clang-1700.6.3.2)
     + Copyright:    (C) 2025 Geoscience Australia.
                     This software is released under the Apache License.
     + Contact:      geodesy@ga.gov.au
     +---------------------------------------------------------------------------

     + Options:
       Network name:                    Coffs Harbour_20250910_1205_2_1
       Input folder:                    .
       Output folder:                   .
       Associated station file:         ./Coffs Harbour_20250910_1205_2_1.asl
       Associated measurement file:     ./Coffs Harbour_20250910_1205_2_1.aml
       Binary station file:             ./Coffs Harbour_20250910_1205_2_1.bst
       Binary measurement file:         ./Coffs Harbour_20250910_1205_2_1.bms
       Adjustment output file:          ./Coffs Harbour_20250910_1205_2_1.simult.adj
       Coordinate output file:          ./Coffs Harbour_20250910_1205_2_1.simult.xyz
       Reference frame:                 GDA2020
       Epoch:                           01.01.2020
       Geoid model:                     /Users/daleroberts/GA/AUSGeoid2020_20180201.gsb

     + Simultaneous adjustment mode

     + Preparing for adjustment...  done.
     + Adjusting network...
       Iteration  1, max station corr: -1392.9830 n
       Iteration  2, max station corr: -518.0348 n
       Iteration  3, max station corr:  454.9091 n
       Iteration  4, max station corr: -562.0298 e
       Iteration  5, max station corr:  287.3892 e
       Iteration  6, max station corr:   94.7611 e
       Iteration  7, max station corr: -121.5639 e
       Iteration  8, max station corr:  161.0819 e
       Iteration  9, max station corr: -189.8751 e
       Iteration 10, max station corr:  228.4152 e
       Iteration 11, max station corr: -245.0453 e
       Iteration 12, max station corr:  264.3107 e
       Iteration 13, max station corr: -269.4833 e
       Iteration 14, max station corr:  274.9714 e
       Iteration 15, max station corr: -276.1467 e
       Iteration 16, max station corr:  277.3662 e
       Iteration 17, max station corr: -277.6173 e
       Iteration 18, max station corr:  277.8651 e
       Iteration 19, max station corr: -277.9137 e
       Iteration 20, max station corr:  277.9572 e
       Iteration 21, max station corr: -277.9723 e
       Iteration 22, max station corr:  277.9862 e
       Iteration 23, max station corr: -277.9901 e
       Iteration 24, max station corr:  277.9908 e
       Iteration 25, max station corr: -277.9990 e
       Iteration 26, max station corr:  278.0017 e
       Iteration 27, max station corr: -278.0064 e
       Iteration 28, max station corr:  277.9953 e
       Iteration 29, max station corr: -277.9970 e
       Iteration 30, max station corr:  277.9924 e
       Iteration 31, max station corr: -277.9955 e
       Iteration 32, max station corr:  277.9937 e
       Iteration 33, max station corr: -277.9976 e
       Iteration 34, max station corr:  277.9935 e
       Iteration 35, max station corr: -277.9951 e
       Iteration 36, max station corr:  277.9945 e

... and so on.

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