Why the basis inverse for artifical variable at first iteration is the identity matrix?
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Description
From the code in `OSI`, I know that the artifical variable is defined as `lb <= s <= ub, Ax - s = 0`.
As a result, the basis matrix of the artificial variables `s` should be the `-I` instead of `I`(identity matrix), but in `s.basisInverse`, I still see `I`.
Can anyone explain this confusion?
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