Comments (2)
I’m thinking of adding
choosedomainspace(operator,rangespace)
that will choose a domain space given the range space, but where the range space can be changed in the process. So we’d have
choosedomainspace(Derivative(),Ultrasperical{0}()) == Ultraspherical{0}()
choosedomainspace(Derivative(),Ultrasperical{1}()) == Ultraspherical{0}()
choosedomainspace(Derivative(),Ultrasperical{2}()) == Ultraspherical{1}()
choosedomainspace(RealOperator(),Laurent()) == ReImSpace(Laurent())
choosedomainspace(::,ds)=ds # default, and equivalent to current situation
This would navigate down the tree and promote the spaces as neccesary on the way back up. One use case that's not clear is the original question: should
choosedomainsace(Multiplication(x,UnsetSpace()),AnySpace())
return domainspace(x)? there could be an issue with the "correct" space coming from another part of the tree... but maybe this is an edge situation where its fine to insist that spaces are specified by hand.
from approxfun.jl.
That was easier than expected :) It defaults to
choosedomainspace(A::Operator,::)=domainspace(A)
but operators that support UnsetSpace can override it. Right now only Multiplication does, but RealOperator is next
from approxfun.jl.
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from approxfun.jl.