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Basis status error on return from postsolve #1896

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jajhall opened this issue Aug 27, 2024 · 0 comments
Open

Basis status error on return from postsolve #1896

jajhall opened this issue Aug 27, 2024 · 0 comments
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jajhall commented Aug 27, 2024

For afiro Row 9 (variable 41) has [lower, value, upper]=[-inf,1e-14,0] but postsolve returns basis status kLower.

This gets fixed when calling the simplex solver but, when highs_debug_level=2 or force_debug = true; in HighsSolutionDebug.cpp line 1470, a call to debugHighsSolution yields a call to getKktFailures and exposes the error.

@jajhall jajhall self-assigned this Aug 27, 2024
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