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negative bandwidth in interlace operator #575

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negative bandwidth in interlace operator #575

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9 changes: 6 additions & 3 deletions src/Operators/general/InterlaceOperator.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -94,8 +94,10 @@ const MatrixInterlaceOperator = InterlaceOperator{T,2,DS,RS} where {T,DS,RS<:Spa
__interlace_ops_bandwidths(ops::AbstractMatrix) = bandwidths.(ops)
__interlace_ops_bandwidths(ops::Diagonal) = bandwidths.(parent(ops))
function __interlace_bandwidths_square(ops::AbstractMatrix, bw = __interlace_ops_bandwidths(ops))
Base.require_one_based_indexing(ops)
p=size(ops,1)
l,u = 0,0
opbw = bw[1,1]
l,u = p*opbw[1], p*opbw[2]
for k=axes(ops,1), j=axes(ops,2)
opbw = bw[k,j]
l = max(l, p*opbw[1]+k-j)
Expand All @@ -105,8 +107,9 @@ function __interlace_bandwidths_square(ops::AbstractMatrix, bw = __interlace_ops
end
function __interlace_bandwidths_square(ops::Diagonal, bw = __interlace_ops_bandwidths(ops))
p=size(ops,1)
l,u = 0,0
for k=axes(ops,1)
opbw = bw[1]
l,u = p*opbw[1], p*opbw[2]
for k=axes(ops,1)[2:end]
opbw = bw[k]
l = max(l, p*opbw[1])
u = max(u, p*opbw[2])
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