OffsetArrays.jl
OffsetArrays provides Julia users with arrays that have arbitrary indices, similar to those found in some other programming languages like Fortran.
Usage
You can construct such arrays as follows:
OA = OffsetArray(A, axis1, axis2, ...)where you want OA to have axes (axis1, axis2, ...) and be indexed by values that
fall within these axis ranges. Example:
using OffsetArrays
julia> A = Float64.(reshape(1:15, 3, 5))
3×5 Matrix{Float64}:
1.0 4.0 7.0 10.0 13.0
2.0 5.0 8.0 11.0 14.0
3.0 6.0 9.0 12.0 15.0
julia> OA = OffsetArray(A, -1:1, 0:4) # OA will have axes (-1:1, 0:4)
3×5 OffsetArray(::Matrix{Float64}, -1:1, 0:4) with eltype Float64 with indices -1:1×0:4:
1.0 4.0 7.0 10.0 13.0
2.0 5.0 8.0 11.0 14.0
3.0 6.0 9.0 12.0 15.0
julia> OA = OffsetArray(A, CartesianIndex(-1, 0):CartesianIndex(1, 4))
3×5 OffsetArray(::Matrix{Float64}, -1:1, 0:4) with eltype Float64 with indices -1:1×0:4:
[...]
julia> OA[-1,0], OA[1,4]
(1.0, 15.0)