Add needs_square_A trait
#400
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src/LinearSolve.jl
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| function for custom algorithms! | ||
| """ | ||
| needs_square_A(::Nothing) = false # Linear Solve automatically will use a correct alg! | ||
| function needs_square_A(alg::SciMLLinearSolveAlgorithm) |
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Just remove the fallback please.
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Or rather, the fallback is true. That's a safe fallback, methods can opt-in to supporting non-square, but anything that supports non-square supports square so that's a safe assumption.
| DefaultAlgorithmChoice.QRFactorization | ||
| if is_underdetermined(A) | ||
| # Underdetermined | ||
| DefaultAlgorithmChoice.QRFactorizationPivoted |
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QRFactorization is already pivoted?
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oh I see. @YingboMa what do you think of just always defaulting to pivoted QR?
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Yeah, pivoted QR handles degenerate systems too.
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But it's quite a bit slower though.
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Makes the following changes:
needs_square_Atrait for solvers