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Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- src/structured.jl: Diagonal (exact analytic) and a unified PlusMinus1Banded implementation (SymTridiagonal, Bidiagonal, Tridiagonal) using A[i,i]/A[i,i+1]/A[i+1,i] indexing so structural zeros are skipped cheaply. symcover/symdiagcover accept any PlusMinus1Banded so callers can use a symmetric-valued Tridiagonal. - src/covers.jl: Adjoint/Transpose wrappers that unwrap the parent and swap cover dimensions. - test/runtests.jl: tests for all of the above. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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- Coverage 100.00% 92.84% -7.16%
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These two commits support SparseMatrixCSC and "PlusMinus1Banded" matrices (Tridiagonal etc).