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Add zero AffineMap helper #1003

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Apr 28, 2024
Merged

Add zero AffineMap helper #1003

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6 changes: 6 additions & 0 deletions src/Fields/AffineMaps.jl
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Expand Up @@ -108,3 +108,9 @@ function lazy_map(::typeof(∇),a::LazyArray{<:Fill{typeof(affine_map)}})
gradients = a.args[1]
lazy_map(constant_field,gradients)
end

function Base.zero(::Type{<:AffineMap{D1,D2,T}}) where {D1,D2,T}
gradient = TensorValue{D1,D2}(tfill(zero(T),Val{D1*D2}()))
origin = Point{D2,T}(tfill(zero(T),Val{D2}()))
AffineMap(gradient,origin)
end
1 change: 1 addition & 0 deletions src/Fields/Fields.jl
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Expand Up @@ -8,6 +8,7 @@ import Gridap.Arrays: testitem

using Gridap.Helpers: @abstractmethod, @notimplemented
using Gridap.Helpers: @notimplementedif, @unreachable, @check
using Gridap.Helpers: tfill

using Gridap.Algebra: mul!

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3 changes: 3 additions & 0 deletions test/FieldsTests/AffineMapsTests.jl
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Expand Up @@ -39,6 +39,9 @@ cell_to_∇hx = lazy_map(evaluate,cell_to_∇h,cell_to_x)
test_array(cell_to_hx,fill(hx,ncells))
test_array(cell_to_∇hx,fill(∇hx,ncells))

T = AffineMap{3,3,Int}
@test isa(zero(T),T)

#display(cell_to_hx)
#display(cell_to_∇hx)
#print_op_tree(cell_to_hx)
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