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add BO equation #65

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MikaelSlevinsky
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  • add Hilbert_{\R}{f}(z), the Hilbert transform on the real line for
    periodic functions on [a,b). This is equivalent to the cotangent
    version. However, it breaks with the convention of the package that the
    domain of integration of the singular integral operator should be
    defined by the domainspace. Perhaps this case could be an exception?
  • fix a typo in periodicline

- add Hilbert_{\R}{f}(z), the Hilbert transform on the real line for
periodic functions on [a,b). This is equivalent to the cotangent
version. However, it breaks with the convention of the package that the
domain of integration of the singular integral operator should be
defined by the domainspace. Perhaps this case could be an exception?

fix a typo in periodicline
@dlfivefifty
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Probably PeriodicInterval should actually be the line, and evaluation defined for all R by moding. I can't think of an example where you actually want the current behaviour.

We could even rename PeriodicIntercal to "Torus"

(, periodicline is used already to mean a conformally mapped circle.)

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On 20 Dec 2015, at 01:49, Richard Mikael Slevinsky [email protected] wrote:

add Hilbert_{\R}{f}(z), the Hilbert transform on the real line for
periodic functions on [a,b). This is equivalent to the cotangent
version. However, it breaks with the convention of the package that the
domain of integration of the singular integral operator should be
defined by the domainspace. Perhaps this case could be an exception?

fix a typo in periodicline

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#65

Commit Summary

add BO equation
File Changes

M .gitignore (2)
A examples/Time Evolution PDSIES.ipynb (4052)
M src/Operators/Hilbert.jl (69)
M src/periodicline.jl (2)
Patch Links:

https://github.com/ApproxFun/SingularIntegralEquations.jl/pull/65.patch
https://github.com/ApproxFun/SingularIntegralEquations.jl/pull/65.diff

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@MikaelSlevinsky
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The Benjamin-Ono equation with periodic boundary conditions (as implemented) has periodic analogues to solitons, so I think that would be interesting to some.

http://www.diva-portal.org/smash/get/diva2:617038/FULLTEXT01.pdf

I guess we just need to figure out what to call the real line with periodicity, i.e. f(t+b-a) = f(t) for all t in R.

I don't think you need to mod for evaluation if the basis is periodic too, it's the perfect extrapolation.

MikaelSlevinsky and others added 4 commits December 22, 2015 17:07
time evolution uses BDF2

basis is LaurentDirichlet(PeriodicLine())
# Conflicts:
#	test/runtests.jl
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Brings back memories!

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2 participants