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Make LinearExpression multiplication with constant containing subset of dimensions consistent with Variable behaviour - #571
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RobbieKiwi
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Feb 9, 2026
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@FabianHofmann I like your PR #572 better so I will close this one |
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Mar 14, 2026
Documents 5 categories of legacy issues with paired legacy/v1 tests: 1. Positional alignment (#586, #550): same-shape operands with different labels silently paired by position, producing wrong results 2. Subset constant associativity (#572): left-join drops coordinates, making (a+c)+b != a+(c+b) 3. User NaN swallowed (#620): NaN in user data silently filled with inconsistent neutral elements (0 for add/mul, 1 for div) 4. Variable vs Expression inconsistency (#569, #571): x*c and (1*x)*c previously gave different results 5. Absent slot propagation (#620): legacy can't distinguish absent variables from zero, fillna() is a no-op Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Closes#569#570
Changes proposed in this Pull Request
Now LinearExpression behaves the same way as Variable when multiplying with a constant containing a susbet of dimensions. Still it is not consistent with addition.
For addition, when a coord is mising we just add 0 (I.e do nothing at that coord)
Perhaps the equivalent for multiplication would be to multiply by 1 (also do nothing) rather than fill with nan?
Checklist
doc.doc/release_notes.rstof the upcoming release is included.