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eps-sparsify for both sparse and dense matrices

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kalmarek 2017-08-27 18:58:01 +02:00
parent 151a6ff6da
commit 7dbd11bebf
1 changed files with 33 additions and 11 deletions
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32
src/Orbit-wise.jl
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@ -57,20 +57,42 @@ include("OrbitDecomposition.jl")
dens(M::SparseMatrixCSC) = length(M.nzval)/length(M)
dens(M::AbstractArray) = length(findn(M)[1])/length(M)
function sparsify{T}(U::AbstractArray{T}, check=true)
function sparsify!{Tv,Ti}(M::SparseMatrixCSC{Tv,Ti}, eps=eps(Tv))
n = nnz(M)
for i in eachindex(M.nzval)
if abs(M.nzval[i]) < eps
M.nzval[i] = zero(Tv)
end
end
dropzeros!(M)
m = nnz(M)
info("Sparsified density:", rpad(dens(U), 15), "→", rpad(dens(W),15))
return M
end
function sparsify!{T}(U::AbstractArray{T}, eps=eps(T); check=true)
if check
W = deepcopy(U)
W[abs.(W) .< eps(T)] .= zero(T)
if check && rank(W) != rank(U)
else
W = U
end
W[abs.(W) .< eps] .= zero(T)
if check
info("Sparsification would decrease the rank!")
W = U
else
info("Sparsified:", rpad(dens(U), 10), "\t", rpad(dens(W),10))
info("Sparsified density:", rpad(dens(U), 15), "→", rpad(dens(W),15))
end
W = sparse(W)
dropzeros!(W)
return W
end
sparsify{T}(U::AbstractArray{T}, tol=eps(T)) = sparsify!(deepcopy(U), tol)
function init_orbit_data(logger, sett::Settings; radius=2)
ex(fname) = isfile(joinpath(sett.name, fname))