Finite Element Spaces and Arrays

struct FESpace{Tv, Ti, FEType<:AbstractFiniteElement,AT<:AssemblyType}
    name::String                          # full name of finite element space (used in messages)
    broken::Bool                          # if true, broken dofmaps are generated
    ndofs::Int                            # total number of dofs
    coffset::Int                          # offset for component dofs
    xgrid::ExtendableGrid[Tv,Ti}          # link to xgrid 
    dofmaps::Dict{Type{<:AbstractGridComponent},Any} # backpack with dofmaps
end

A struct that has a finite element type as parameter and carries dofmaps (CellDofs, FaceDofs, BFaceDofs) plus additional grid information and access to arrays holding coefficients if needed.

function FESpace{FEType<:AbstractFiniteElement,AT<:AssemblyType}(
    xgrid::ExtendableGrid{Tv,Ti};
    name = "",
    broken::Bool = false)

Constructor for FESpace of the given FEType, AT = ONCELLS/ONFACES/ONEDGES generates a finite elements space on the cells/faces/edges of the provided xgrid (if omitted ONCELLS is used as default). The broken switch allows to generate a broken finite element space (that is piecewise H1/Hdiv/HCurl). If no name is provided it is generated automatically from FEType. If no AT is provided, the space is generated ON_CELLS.

eltype(
    _::FESpace{Tv, Ti, FEType<:AbstractFiniteElement, APT}
) -> Type{FEType} where FEType<:AbstractFiniteElement

Custom eltype function for FESpace returns the finite element type parameter of the finite element space.

get!(FES::FESpace, DM::Type{<:DofMap}) -> Any

To be called by getindex. This triggers lazy creation of non-existing dofmaps

Base.getindex(FES::FESpace,DM::Type{<:DofMap})

Generic method for obtaining dofmap. This method is mutating in the sense that non-existing dofmaps are created on demand. Due to the fact that components are stored as Any the return value triggers type instability.

setindex!(FES::FESpace, v, DM::Type{<:DofMap}) -> Any

Set new dofmap

show(
    io::IO,
    FES::FESpace{Tv, Ti, FEType<:AbstractFiniteElement, APT}
)

Custom show function for FESpace that prints some information and all available dofmaps.

assemblytype(
    _::FESpace{Tv, Ti, FEType<:AbstractFiniteElement, APT}
) -> Any

returns the assembly type parameter of the finite element space, i.e. on which entities of the grid the finite element is defined.

abstract type DofMap <: AbstractGridAdjacency

Dofmaps are stored as an ExtendableGrids.AbstractGridAdjacency in the finite element space and collect information with respect to different AssemblyTypes. They are generated automatically on demand and the dofmaps associated to each subtype can be accessed via FESpace[DofMap].

struct FEVector{T, Tv, Ti}

a plain array but with an additional layer of several FEVectorBlock subdivisions each carrying coefficients for their associated FESpace

FEVector{T}(FES; name = "auto") where T <: Real

Creates FEVector that has one block if FES is a single FESpace, and a blockwise FEVector if FES is a vector of FESpaces. Optionally a name for the vector (as a String), or each of the blocks (as a vector of Strings) can be specified.

struct FEVectorBlock{T, Tv, Ti, FEType, APT} <: AbstractArray{T, 1}

block of an FEVector that carries coefficients for an associated FESpace and can be assigned as an AbstractArray (getindex, setindex, size, length)

append!(
    FEF::FEVector{T},
    name::String,
    FES::FESpace{Tv, Ti, FEType, APT}
)

Custom append function for FEVector that adds a FEVectorBlock at the end.

fill!(b::FEVectorBlock, value)

Custom fill function for FEVectorBlock (only fills the block, not the complete FEVector).

length(FEB::FEVectorBlock) -> Int64

Custom length function for FEVectorBlock that gives the coressponding number of degrees of freedoms of the associated FESpace

length(FEF::FEVector) -> Int64

Custom length function for FEVector that gives the number of defined FEMatrixBlocks in it

show(io::IO, FEF::FEVector)

Custom show function for FEVector that prints some information on its blocks.

FESpaces(FEV::FEVector{T, Tv, Ti}) -> Any

Returns the vector of FEspaces for the blocks of the given FEVector.

addblock!(a::FEVectorBlock, b::AbstractVector; factor)

Adds Array b to FEVectorBlock a.

addblock!(a::FEVectorBlock, b::FEVectorBlock; factor)

Adds FEVectorBlock b to FEVectorBlock a.

dot(a::FEVectorBlock{T}, b::FEVectorBlock{T}) -> Any

Scalar product between two FEVEctorBlocks

struct FEMatrix{TvM, TiM, TvG, TiG, nbrow, nbcol, nbtotal}

an AbstractMatrix (e.g. an ExtendableSparseMatrix) with an additional layer of several FEMatrixBlock subdivisions each carrying coefficients for their associated pair of FESpaces

FEMatrix{TvM,TiM}(FESX, FESY; name = "auto")

Creates FEMatrix with one rectangular block (FESX,FESY) if FESX and FESY are single FESpaces, or a rectangular block matrix with blocks corresponding to the entries of the FESpace vectors FESX and FESY. Optionally a name for the matrix can be given.

FEMatrix{TvM,TiM}(name::String, FES::FESpace{TvG,TiG,FETypeX,APTX}) where {TvG,TiG,FETypeX,APTX}

Creates FEMatrix with one square block (FES,FES).

struct FEMatrixBlock{TvM, TiM, TvG, TiG, FETypeX, FETypeY, APTX, APTY} <: AbstractArray{TvM, 2}

block of an FEMatrix that carries coefficients for an associated pair of FESpaces and can be assigned as an two-dimensional AbstractArray (getindex, setindex, size)

fill!(B::FEMatrixBlock{Tv, Ti}, value)

Custom fill function for FEMatrixBlock (only fills the block, not the complete FEMatrix).

length(
    _::FEMatrix{TvM, TiM, TvG, TiG, nbrow, nbcol, nbtotal}
) -> Any

Custom length function for FEMatrix that gives the total number of defined FEMatrixBlocks in it

show(
    io::IO,
    FEM::FEMatrix{TvM, TiM, TvG, TiG, nbrow, nbcol, nbtotal}
)

Custom show function for FEMatrix that prints some information on its blocks.

size(FEB::FEMatrixBlock) -> Tuple{Int64, Int64}

Custom size function for FEMatrixBlock that gives a tuple with the size of the block (that coressponds to the number of degrees of freedoms in X and Y)

size(
    _::FEMatrix{TvM, TiM, TvG, TiG, nbrow, nbcol, nbtotal}
) -> Tuple{Any, Any}

Custom size function for FEMatrix that gives a tuple with the number of rows and columns of the FEBlock overlay

add!(
    A::FEMatrix{Tv, Ti},
    B::FEMatrix{Tv, Ti};
    factor,
    transpose
)

Adds FEMatrix B to FEMatrix A.

addblock!(
    A::FEMatrixBlock{Tv, Ti},
    B::FEMatrixBlock{Tv, Ti};
    factor,
    transpose
)

Adds FEMatrixBlock B to FEMatrixBlock A.

addblock!(
    A::FEMatrixBlock{Tv},
    B::ExtendableSparseMatrix{Tv, Ti<:Integer};
    factor,
    transpose
)

Adds ExtendableSparseMatrix B to FEMatrixBlock A.

addblock!(
    A::FEMatrixBlock{Tv},
    cscmat::SparseArrays.SparseMatrixCSC{Tv, Ti<:Integer};
    factor,
    transpose
)

Adds SparseMatrixCSC B to FEMatrixBlock A.

addblock_matmul!(
    a::AbstractArray{Tv, 1},
    B::FEMatrixBlock{Tv, Ti},
    b::AbstractArray{Tv, 1};
    factor,
    transposed
)

Adds matrix-vector product B times b to FEVectorBlock a.

addblock_matmul!(
    A::FEMatrixBlock{Tv},
    cscmatB::SparseArrays.SparseMatrixCSC{Tv, Ti},
    cscmatC::SparseArrays.SparseMatrixCSC{Tv, Ti};
    factor,
    transposed
)

Adds matrix-matrix product B times C to FEMatrixBlock A.

addblock_matmul!(
    a::FEVectorBlock{Tv},
    B::ExtendableSparseMatrix{Tv, Ti<:Integer},
    b::FEVectorBlock{Tv};
    factor
)

Adds matrix-vector product B times b to FEVectorBlock a.

addblock_matmul!(
    a::FEVectorBlock{Tv},
    B::FEMatrixBlock{Tv, Ti},
    b::FEVectorBlock{Tv};
    factor,
    transposed
)

Adds matrix-vector product B times b (or B' times b if transposed = true) to FEVectorBlock a.

ldrdmatmul(
    a1::AbstractArray{Tv, 1},
    a2::AbstractArray{Tv, 1},
    B::ExtendableSparseMatrix{Tv, Ti<:Integer},
    b1::AbstractArray{Tv, 1},
    b2::AbstractArray{Tv, 1};
    factor
) -> Any

Computes vector'-matrix-vector product (a1-a2)'B(b1-b2).

lrmatmul(
    a::AbstractArray{Tv, 1},
    B::ExtendableSparseMatrix{Tv, Ti<:Integer},
    b::AbstractArray{Tv, 1};
    factor
) -> Any

Computes vector'-matrix-vector product a'Bb.

nbcols(
    _::FEMatrix{TvM, TiM, TvG, TiG, nbrow, nbcol, nbtotal}
) -> Any

Gives the number of FEMatrixBlocks in each row.

nbrows(
    _::FEMatrix{TvM, TiM, TvG, TiG, nbrow, nbcol, nbtotal}
) -> Any

Gives the number of FEMatrixBlocks in each column.