Convert linear index to 2D indices

Use CartesianIndices((nrow, ncol)) ¹.

x = rand((7, 10))
CI = CartesianIndices((7, 10))
for i in 1:length(x)
    r = CI[i][1]
    c = CI[i][2]
    @assert x[i] == x[r, c]
end

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1. https://discourse.julialang.org/t/julia-usage-how-to-get-2d-indexes-from-1d-index-when-accessing-a-2d-array/61440 ↩

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