Fix eigenvector calculation for subdim=2 case in SymmetricEigen
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@ -199,10 +199,21 @@ where
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diag[start + 1].clone(),
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);
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let eigvals = m.eigenvalues().unwrap();
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let basis = Vector2::new(
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eigvals.x.clone() - diag[start + 1].clone(),
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off_diag[start].clone(),
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);
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// Choose the basis least likely to experience cancellation
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let basis = if (eigvals.x.clone() - diag[start + 1].clone()).abs()
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> (eigvals.x.clone() - diag[start].clone()).abs()
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{
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Vector2::new(
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eigvals.x.clone() - diag[start + 1].clone(),
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off_diag[start].clone(),
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)
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} else {
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Vector2::new(
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off_diag[start].clone(),
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eigvals.x.clone() - diag[start].clone(),
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)
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};
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diag[start] = eigvals[0].clone();
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diag[start + 1] = eigvals[1].clone();
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