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domain checking #9

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tpapp opened this issue Feb 27, 2020 · 1 comment
Open

domain checking #9

tpapp opened this issue Feb 27, 2020 · 1 comment
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enhancement New feature or request

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@tpapp
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tpapp commented Feb 27, 2020

Evaluation of basis functions and linear combinations should support various forms of domain checking, eg

  1. no checking (as currently done), this will just error because of acos for Chebyshev
  2. strict checking (terminate with an informative DomainError
  3. "soft" extrapolation: when within a small distance of boundaries, just use the boundary value (mostly for dealing with floating point error)

Cf #7, a refactor should implement both.
@tpapp tpapp added the enhancement New feature or request label Feb 27, 2020
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tpapp commented Jun 8, 2022

We no longer use acos internally, so this is less of an issue. With arguments near the boundary, the error is nicely bounded, so it should not matter. Perhaps document this though.

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