Dear all, I have some problems with CartesianIndex. In numpy when I want to index of nonzero elements I can do like this: >>> x = np.array([[3, 0, 0], [0, 4, 0], [5, 6, 0]]) >>> x array([[3, 0, 0], [0, 4, 0], [5, 6, 0]]) >>> a,b=np.nonzero(x) >>> a array([0, 1, 2, 2]) >>> b array([0, …

Firstly, if you want all non-zero, you should write findall(!iszero, x), since x.>0 will give you just positive-valued elements. Secondly, you can convert and extract a and b like this: julia> inds = Tuple.(findall(!iszero, x)) 4-element Array{Tuple{Int64,Int64},1}: (1, 1) (3, 1) (2, 2) (3, 2)…

CartesianIndex to Arrays of index

New to Julia

Per April 26, 2019, 7:43am 8

If one wants to stick to the convention of putting the first index on the y-axis, starting at the top, then one could write:

plot(reverse.(inds), yaxis=:flip)

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CartesianIndex to Arrays of index

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