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annotate stencil.jl @ 122:6c6979ff17f4 cell_based_test

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Introduce and use apply_backwards for stencils
author Jonatan Werpers <jonatan@werpers.com>
date Tue, 12 Feb 2019 15:18:18 +0100
parents 8d505e9bc715
children 7c0b9bb7ab4d
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48079bd39969 Change to using tuples in stencils and ops
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1 struct Stencil{T<:Real,N}
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2 range::Tuple{Int,Int}
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3 weights::NTuple{N,T}
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4 end
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5
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6 function flip(s::Stencil)
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7 range = (-s.range[2], -s.range[1])
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8 return Stencil(range, reverse(s.weights))
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9 end
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11 # Provides index into the Stencil based on offset for the root element
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12 function Base.getindex(s::Stencil, i::Int)
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13 @boundscheck if i < s.range[1] || s.range[2] < i
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14 return eltype(s.weights)(0)
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15 end
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16
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17 return s.weights[1 + i - s.range[1]]
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18 end
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19
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20 Base.@propagate_inbounds function apply(s::Stencil, v::AbstractVector, i::Int)
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21 w = zero(eltype(v))
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22 for j ∈ s.range[1]:s.range[2]
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23 @inbounds weight = s[j]
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24 w += weight*v[i+j]
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25 end
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26 return w
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27 end
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29 Base.@propagate_inbounds function apply_backwards(s::Stencil, v::AbstractVector, i::Int)
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30 w = zero(eltype(v))
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31 for j ∈ s.range[2]:-1:s.range[1]
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32 @inbounds weight = s[j]
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33 w += weight*v[i-j]
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34 end
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35 return w
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36 end