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annotate src/SbpOperators/boundaryops/boundary_operator.jl @ 1909:4209290cb377 feature/grids/parameter_spaces

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Add missing using-statement
author Jonatan Werpers <jonatan@werpers.com>
date Fri, 07 Feb 2025 15:28:01 +0100
parents 3714a391545a
children
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1 """
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2 BoundaryOperator{T,B,N} <: LazyTensor{T,0,1}
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4 Implements the boundary operator `op` for 1D as a `LazyTensor`
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6 `op` is the restriction of a grid function to the boundary using some closure
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7 `Stencil{T,N}`. The boundary to restrict to is determined by `B`. `op'` is the
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8 prolongation of a zero dimensional array to the whole grid using the same
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9 closure stencil.
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10 """
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11 struct BoundaryOperator{T,B<:BoundaryIdentifier,N} <: LazyTensor{T,0,1}
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12 stencil::Stencil{T,N}
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13 size::Int
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14 end
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16 """
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17 BoundaryOperator(grid::EquidistantGrid, closure_stencil, boundary)
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19 Constructs the BoundaryOperator with stencil `closure_stencil` for a
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20 `EquidistantGrid` `grid`, restricting to to the boundary specified by
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21 `boundary`.
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22 """
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23 function BoundaryOperator(grid::EquidistantGrid, closure_stencil::Stencil{T,N}, boundary::BoundaryIdentifier) where {T,N}
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24 return BoundaryOperator{T,typeof(boundary),N}(closure_stencil,size(grid)[1])
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25 end
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27 """
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28 closure_size(::BoundaryOperator)
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30 The size of the closure stencil.
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31 """
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32 closure_size(::BoundaryOperator{T,B,N}) where {T,B,N} = N
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34 LazyTensors.range_size(op::BoundaryOperator) = ()
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35 LazyTensors.domain_size(op::BoundaryOperator) = (op.size,)
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36
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37 function LazyTensors.apply(op::BoundaryOperator{<:Any,LowerBoundary}, v::AbstractVector)
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38 apply_stencil(op.stencil,v,1)
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39 end
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40
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41 function LazyTensors.apply(op::BoundaryOperator{<:Any,UpperBoundary}, v::AbstractVector)
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42 apply_stencil_backwards(op.stencil,v,op.size)
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43 end
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44
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45 function LazyTensors.apply_transpose(op::BoundaryOperator{<:Any,LowerBoundary}, v::AbstractArray{<:Any,0}, i::Index{Lower})
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46 return op.stencil[Int(i)-1]*v[]
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47 end
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48
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49 function LazyTensors.apply_transpose(op::BoundaryOperator{<:Any,UpperBoundary}, v::AbstractArray{<:Any,0}, i::Index{Upper})
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50 return op.stencil[op.size[1] - Int(i)]*v[]
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51 end
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53 # Catch all combinations of Lower, Upper and Interior not caught by the two previous methods.
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54 function LazyTensors.apply_transpose(op::BoundaryOperator, v::AbstractArray{<:Any,0}, i::Index)
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55 return zero(eltype(v))
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56 end
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57
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58 function LazyTensors.apply_transpose(op::BoundaryOperator, v::AbstractArray{<:Any,0}, i)
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59 r = getregion(i, closure_size(op), op.size)
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60 apply_transpose(op, v, Index(i,r))
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61 end