UniformScaling

Author: dlfivefifty

Project.toml

@@ -14,10 +14,10 @@ MatrixFactorizations = "a3b82374-2e81-5b9e-98ce-41277c0e4c87"
 
 
 [compat]
-BandedMatrices = "0.12.4"
+BandedMatrices = "0.13"
 BlockArrays = "0.10"
 BlockBandedMatrices = "0.5.1"
-FillArrays = "0.7.1"
+FillArrays = "0.7.1, 0.8"
 InfiniteArrays = "0.4"
 LazyArrays = "0.12.4"
 MatrixFactorizations = "0.2"

src/banded/infbanded.jl

@@ -319,4 +319,18 @@ _BandedMatrix(::PertToeplitzLayout, A::AbstractMatrix) =
 
 #         sub_materialize(::$Lay, V) = BandedMatrix(V)    
 #     end
-# end
+# end
+
+
+##
+# UniformScaling
+##
+
+for op in (:+, :-), Typ in (:(BandedMatrix{<:Any,<:Any,OneToInf{Int}}), 
+                            :(Adjoint{<:Any,<:BandedMatrix{<:Any,<:Any,OneToInf{Int}}}),
+                            :(Transpose{<:Any,<:BandedMatrix{<:Any,<:Any,OneToInf{Int}}}))
+    @eval begin
+        $op(A::$Typ, λ::UniformScaling) = $op(A, Diagonal(Fill(λ.λ,∞)))
+        $op(λ::UniformScaling, A::$Typ) = $op(Diagonal(Fill(λ.λ,∞)), A)
+    end
+end