require RecursiveArrayTools

Author: ChrisRackauckas

Project.toml

@@ -11,14 +11,16 @@ LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 MacroTools = "1914dd2f-81c6-5fcd-8719-6d5c9610ff09"
 StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
 PreallocationTools = "d236fae5-4411-538c-8e31-a6e3d9e00b46"
+RecursiveArrayTools = "731186ca-8d62-57ce-b412-fbd966d074cd"
 
 [compat]
 ArrayInterface = "2.8, 3.0, 4, 5, 6"
 ArrayInterfaceStaticArrays = "0.1"
 ChainRulesCore = "1"
 MacroTools = "0.5"
 PreallocationTools = "0.4"
-StaticArrays = "0.10, 0.11, 0.12, 1.0"
+RecursiveArrayTools = "2"
+StaticArrays = "1.0"
 julia = "1.6"
 
 [extras]

src/LabelledArrays.jl

@@ -1,6 +1,7 @@
 module LabelledArrays
 
 using LinearAlgebra, StaticArrays, ArrayInterface
+import RecursiveArrayTools
 
 include("slarray.jl")
 include("larray.jl")

src/larray.jl

@@ -366,3 +366,6 @@ function Base.vcat(x::LArray, y::LArray)
 end
 
 Base.elsize(::Type{<:LArray{T}}) where {T} = sizeof(T)
+
+RecursiveArrayTools.recursive_unitless_eltype(a::Type{LArray{T, N, D, Syms}}) where {T, N, D, Syms} = 
+                        LArray{typeof(one(T)), N, D, Syms}

src/slarray.jl

@@ -39,6 +39,8 @@ function StaticArrays.similar_type(::Type{SLArray{S, T, N, L, Syms}}, T2,
                                    ::Size{S}) where {S, T, N, L, Syms}
     SLArray{S, T2, N, L, Syms}
 end
+RecursiveArrayTools.recursive_unitless_eltype(a::Type{T}) where {T<:SLArray} = 
+                        StaticArrays.similar_type(a,recursive_unitless_eltype(eltype(a)))
 
 ## Named tuple to SLArray
 #=