Hi,
In Julia, it is usually done for other factorization by indexing with symbols as
Afactored = factoring_func(A)
P=Afactored[:P]
However, searching by

methods(getindex,(Base.LinAlg.BunchKaufman, Symbol))

this factorization isn't available for that indexing.
Also, searching how this factorization type is defined by Julia

?Base.LinAlg.BunchKaufman

No documentation found.
Summary:
immutable Base.LinAlg.BunchKaufman{T,S<:AbstractArray{T,2}} <: Factorization{T}
Fields:
LD        :: S<:AbstractArray{T,2}
ipiv      :: Array{Int32,1}
uplo      :: Char
symmetric :: Bool
rook      :: Bool

If you know what these fields refer you can define your getindex method for 
this factorization. You can get help looking up how other factorization defines 
getindex methods. Also, you can open an issue for this at github repo if not 
already done.
Note: I observed this on v0.5 but I guess it is the same for v0.4.
Best,

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