fix incorrect folder name for julia-0.6.x

Former-commit-id: ef2c7401e0876f22d2f7762d182cfbcd5a7d9c70

julia-0.6.3/share/julia/base/sparse/abstractsparse.jl

@@ -0,0 +1,23 @@
+# This file is a part of Julia. License is MIT: https://julialang.org/license
+
+abstract type AbstractSparseArray{Tv,Ti,N} <: AbstractArray{Tv,N} end
+
+const AbstractSparseVector{Tv,Ti} = AbstractSparseArray{Tv,Ti,1}
+const AbstractSparseMatrix{Tv,Ti} = AbstractSparseArray{Tv,Ti,2}
+
+"""
+    issparse(S)
+
+Returns `true` if `S` is sparse, and `false` otherwise.
+"""
+issparse(A::AbstractArray) = false
+issparse(S::AbstractSparseArray) = true
+
+issparse(S::Symmetric{<:Any,<:AbstractSparseMatrix}) = true
+issparse(S::Hermitian{<:Any,<:AbstractSparseMatrix}) = true
+issparse(S::LowerTriangular{<:Any,<:AbstractSparseMatrix}) = true
+issparse(S::LinAlg.UnitLowerTriangular{<:Any,<:AbstractSparseMatrix}) = true
+issparse(S::UpperTriangular{<:Any,<:AbstractSparseMatrix}) = true
+issparse(S::LinAlg.UnitUpperTriangular{<:Any,<:AbstractSparseMatrix}) = true
+
+indtype(S::AbstractSparseArray{<:Any,Ti}) where {Ti} = Ti