Add smoothing based on Chebyshev polynomials of the fourth kind #856
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Variant 2: Standard, 1st Kind Chebyshev smoothing with $D^{-1}A$.
No restriction on the Chebyshev order.
Variant 3: 4th Kind Chebyshev smoother with $D^{-1}A$.
No restriction on the Chebyshev order.
Variant 4: Optimized 4th Kind Chebyshev smoother with $D^{-1}A$.
Chebyshev order must be in [1,16] due to needing to compute the
$\beta_k$ coefficients.
Variants 3-4 are from https://arxiv.org/pdf/2202.08830.pdf.
These correspond to relaxation type 16.
In addition, relaxation type 19 has been implemented as a "no-op"
smoother. This can be used in the case a user wishes to omit the post
smoothing step, for example.
MalachiTimothyPhillips
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Closes #862
Variant 2: Standard, 1st Kind Chebyshev smoothing with$D^{-1}A$ . No restriction on the Chebyshev order.
Variant 3: 4th Kind Chebyshev smoother with$D^{-1}A$ . No restriction on the Chebyshev order.
Variant 4: Optimized 4th Kind Chebyshev smoother with$D^{-1}A$ . Chebyshev order must be in [1,16] due to needing to compute the $\beta_k$ coefficients.
Variants 3-4 are from https://arxiv.org/pdf/2202.08830.pdf.
These correspond to relaxation type 16.
In addition, relaxation type 19 has been implemented as a "no-op" smoother. This can be used in the case a user wishes to omit the post smoothing step, for example.
p.s.: I'm happy to walk through these changes "offline" on a zoom call.