LuxurySparse

IMatrix{N, Tv}()
IMatrix{N}() where N = IMatrix{N, Int64}()
IMatrix(A::AbstractMatrix{T}) where T -> IMatrix

IMatrix matrix, with size N as label, use Int64 as its default type, both * and kron are optimized.

PermMatrix{Tv, Ti}(perm::AbstractVector{Ti}, vals::AbstractVector{Tv}) where {Tv, Ti<:Integer}
PermMatrix(perm::Vector{Ti}, vals::Vector{Tv}) where {Tv, Ti}
PermMatrix(ds::AbstractMatrix)

PermMatrix represents a special kind linear operator: Permute and Multiply, which means M * v = v[perm] * val Optimizations are used to make it much faster than SparseMatrixCSC.

• perm is the permutation order,
• vals is the multiplication factor.

Generalized Permutation Matrix

SparseMatrixCOO(is::Vector, js::Vector, vs::Vector, m::Int, n::Int) -> SparseMatrixCOO
SparseMatrixCOO{Tv, Ti}(is::Vector{Ti}, js::Vector{Ti}, vs::Vector{Tv}, m::Int, n::Int) -> SparseMatrixCOO

A sparse matrix in COOrdinate format.

Also known as the ‘ijv’ or ‘triplet’ format.

Notes

COO matrices should not be used in arithmetic operations like addition, subtraction, multiplication, division, and matrix power.

Advantages of the COO format

• facilitates fast conversion among sparse formats
• permits duplicate entries (see example)
• very fast conversion to and from CSR/CSC formats (CSR is not implemented)

Disadvantages of the COO format

does not directly support:

• arithmetic operations
• slicing

Intended Usage

• COO is a fast format for constructing sparse matrices
• Once a matrix has been constructed, convert to CSR or CSC format for fast arithmetic and matrix vector operations
• By default when converting to CSR or CSC format, duplicate (i,j) entries will be summed together. This facilitates efficient construction of finite element matrices and the like. (see example)

allocated_coo(::Type, M::Int, N::Int, nnz::Int) -> SparseMatrixCOO

Construct a preallocated SparseMatrixCOO instance.

dynamicize(A::AbstractMatrix) -> AbastractMatrix

transform a matrix to a dynamic form.

faster invperm

isdense(M) -> Bool

Return true if a matrix is dense.

Note: It is not exactly same as !isparse, e.g. Diagonal, IMatrix and PermMatrix are both not isdense and not isparse.

pmrand(T::Type, n::Int) -> PermMatrix

Return random PermMatrix.

staticize(A::AbstractMatrix) -> AbastractMatrix

transform a matrix to a static form.