Fix 2125 #2126
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Fix 2125 #2126
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…cols/rows are deleted
…onbasic row deletion and addition
…and this only assumes a useful basis
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This will close #2125 |
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When columns and rows are deleted from the incumbent LP after a basic solution has been found, HiGHS no longer invalidates the basis. Now it maintains the basic and nonbasic status of the remaining variables and constraints. When the model is re-solved, this information is used to construct a starting basis.