BoundsError when trying to index certain dimensions of an array with a vector containing indices

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2

FYI, it would be much better to make your B 3x3x2.

Your A is a 3x3 mask (based on > 0.5 or not), your B has 2 “layers” of 3x3 matrix.

My understanding is that you want to assign random values to each of those two layers at location according to mask A.

julia> for i = CartesianIndices(A)
           if A[i] > 0.5
               @. B[:, i] = rand()
           end
       end

this should do?

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